Computer Fundamentals Index

Computer Introduction Types of computer Characteristics of computer Uses of computer History of Computers

Computer Languages

Low Level language Middle level Language High level language

Computer Generation

Generation of Computers First Generation of Computer Second generation of Computers Third generation of Computers Fourth generation of Computers Fifth generation of Computers Sixth Generation of Computer

Peripheral Devices

Input devices Output device


Block diagram and basic components Control processing unit (CPU) Software Hardware


Computer Memory Registers Memory Hierarchy RAM Vs ROM Understanding file sizes (Bytes, KB, MB, GB, TB, PB, EB, ZB, YB)

Computer Network

Types of Network Types of Area Networks (LAN, WAN, MAN) TCP Flags

Computer Virus

Computer Virus

Computer Ports

Computer Ports


How to hack a computer How much do Computer Programmers make How does a Computer work How to associate a file with a program How does a computer convert text into binary How does a computer process data into information How to fix a CD-ROM DVD How to fix the no input signal How to install computer memory How to associate a file with a program How to log out of your operating system How do I change my name on Google How to installation or uninstallation Microsoft Paint How to fix a not a valid Win32 application error How to fix missing Microsoft Windows .dll files How to use a computer keyboard How to erase my hard drive and start over How can I test how many words I can write a minute How to shut down a computer How do I open and edit the Windows registry How to edit the registry from the command line How to restart Microsoft Windows How to install a computer processor How to open Microsoft Paint How to fix problems in Windows after installing new software How to enable or disable the preview pane of Microsoft Outlook How to open a Microsoft .wps or Works file in Word How to view the HTML source code in Microsoft Word How to View or Change the Screen Resolution of a Monitor How to Connect and Install a Computer Keyboard How to Delete Temporary Files in Windows 10 How to determine Which Version of Microsoft Office I'm using How to find out how much hard drive space is available How to Fix PC Stuck on Verifying DMI Pool Data How to choose which items show in the notification area How to find similar images using Search by Image How to fix Low Memory and out of memory errors How To Replace the CMOS Battery How do I Update my Antivirus Program How to fix a general protection fault How to Identify problems in the Windows Device Manager How can the Base be Shown How to test if a Website or Web Page is down How Much is 1 Byte, Kilobyte, Megabyte, Gigabyte, etc How to fix a CMOS checksum error How to Fix a Windows CD-ROM, DVD, or Disc Drive Issue How to Open Safe Mode How to Password Protect Files and Folders in Windows How to Reset CMOS or BIOS Settings How to use Computer Keyboard How to create a text file How to enable or disable DHCP in Windows How to test computer memory to determine if its bad How do double space or change line spacing in Microsoft Word How do I know if I have Windows Administrator Rights How many cores does my computer have How to Create a Directory or Folder How to Enter and Exit the BIOS or CMOS Setup How to change Windows Compatibility mode How to clear your internet browser history How to Connect Computer Speakers How to Copy a Web Page Link or URL How to install a Hard Drive or SSD How to Open the Windows Control Panel How to split a screen in Windows How to copy text from a scanned PDF


Who invented Computer What are the advantages of the Internet? What are the disadvantages of the Internet? Is my computer 64 bit? What is Edge Computing? What is a Router? What is Monitor What is Printer What is a Web Browser What is Microphone What is a Webcam What is PC What is Keyboard What is Motherboard What is WAP What is URL What is a Digital Assistant When was the first Computer Invented What is Modem What is Firmware What is Imperative Programming What is Protocol What is Safe Mode What is Device Driver What is Hybrid Topology What is Mesh Topology What is Procedural language What is a hyperlink What is a Username Who invented the Internet What is Video Card What is Sound Card What is Binary What does Alt+B do What does Alt+D do What does Alt+E do What does Alt+Esc do What does Alt+R do What does ALT + Q do What does Alt + Tab do What is Data Manipulation What is a touch screen What is Back Panel What is Analog Monitor What is AR lens What is an ATX Style Connector What is a File System What is Hard Disk Drive (HDD) What is a boot device What is accessibility What is Line In What is network Interface card (NIC) What is Optical Disk Where can I ask questions on the internet What is Auto Rotate What is CAD (Computer-aided design) What is Cable Modem What is Home Page What is boot menu What is braille reader What is flash memory What is Windows What is Clipboard What is Cyber Warfare What is Myspace Why has my IP address changed What is Jacquard Loom My computer is running slow, what steps can I do to fix it What is a Kensington Lock What is a multicore processor What is automation Are smartphones and tablets computers What is a Login Script What is a Loosely Typed Language What is Multitasking? Why my computer monitor shows no display or black screen What is REM What is Parallelization What is Overtype mode What is open with What is Bracket What is an Online Service What is REM What is Parallelization What is Overtype mode What is open with What is Bracket What is an Online Service What is the Pg Dn Key (Page Down Key) What is the Pg up Key (Page up Key) What is Palmtop Computer What is a Processing Device What is a Print Preview What is the Print Screen Key What can I do if my computer or laptop is lost or stolen What is a Model Number What are the currently available antivirus programs What are Toggle keys What is a Case fan What is a Silicon Chip What is a Slate PC What is a TAB stop What is an Octothorpe What is Task Pane What is Task View What is the svchost.exe file used for in Windows Where can I find free online virus scanners Why am I unable to increase the resolution in Windows What is Autofill When I click my mouse, it sometimes double-clicks What is Scratch What is UDIMM What is MsConfig What is an Expansion Card What is an Executable File What is an Elevated Command Prompt What is an AC Adapter What is AIMBOT What is a Software Suite What is a LED Monitor What does Alt + X do What does alt + space do What does Alt + O do Now that I’ve got a Computer, what can i do What is a Punch Card What is RDIMM What is Select All What is Serial number What is Thermos flask What programs can I use for speech recognition What are the Advantages of Computers What are the Disadvantages of Computers What does Alt + T do What Hardware Device Drivers should be Updated What is a Desktop What is a Ring Topology What is CMOS What is a Directory What is a Mechanical Mouse What is a Plotter What is a Variable What is an Icon What is Data What is HDMI What is Remote What is Right-Click What is SMPS Why does my Laptop not turn on What is a Copyright What is a Cordless Mouse What is a CSV file What is a Joystick What is a Start Button What is a Taskbar What is an Alignment What is an Output Device What is Cat 5 What is Google Chrome What is Post What are Recordable DVD Drives What Does Alt + F4 Do What Does Alt + L Do What is a bit (Binary Digit) What is a cable What is a Calculator What is a capacitor What is a Cold Boot What is a Dialog Box What is a Dual-boot What is a Slide What is A4 What is AM What is Barcode Reader What is EHCI What is a Header What is a Joystick What is a Secondary Storage Device What is Access Time What is Account Sharing What is an Asterisk What is Asynchronous DRAM What is Back Quote What is BIOS What is Borderless Printing What is Case Badge What is CD-ROM What is Chat Slang What is Composite What is RJ Cable What Are Bottom Row Keys What is SAN What is Tray What is VDU What Does Alt + M Do What Does Alt + P Do What is a Cell What is a Command Key What is a key Combination What is a Menu Bar What is a Startup What is a T What is Chat What are the F1 through F12 keys What does Alt + Enter do What Does Alt + Home DO What does Alt + R do What does Ctrl + B do What Does Ctrl + Enter Do What Does Ctrl + R Do What does Ctrl + G do What does Ctrl + 9 do What does Ctrl + End do What does Ctrl + O do What Does Ctrl + P do What Does Ctrl + Q do What is a Colon What is a Core What is Apple Touch Icon What is Clock What is Code What is Computer Crime What is Ctrl What is DAT What is Data diddling What is Date Why won't my computer turn on What Does Alt + N Do What does ctrl + 2 do What does ctrl + space do What does Ctrl + W do What does Ctrl + T Do What Does Ctrl + 2 do What does Ctrl + 5 Do What are the most common file types and file extensions What are Sticky keys What Does Ctrl + Shift + Esc Do What is Settings What is Task Manager What is Taskbar What is a DNS Resolver What does ctrl + 1 do What does ctrl + 0 do How to install software What is a Folder What is a Legend What is a MAC Address What is a Path What is a Ruler What is a Toolbar What is an Intranet Meaning and Differences with Internet What is an SSD What is Inheritance What is Tablet What is Depth What is Docking Station What is Double Click What is a Solid Ink Printer What is a Temporary File What is Backup and Restore What is Electronic Payment Systems Eps What is Marshalling


Difference between hardware and software Difference between multiprocessor and distributed systems Difference between Desktop and Laptop Difference between File and folder Difference between Hard Copy and Soft Copy Open Source Programs vs Closed Source Programs Difference between Optical Fibre and Coaxial Cable Difference between Website and Webpage Difference between Classes and Objects Input VS Output Difference between Primary and Secondary Storage with Examples


Quantum Computing Computer Software Autoexec.bat and config.sys info Update an Antivirus Use of Internet Advantages and disadvantages of Email Computing Power Internet Explorer Shortcut Keys Advanced Encryption Standard (AES) Augmented Reality Infrastructure Readiness Check Top 10 Internet tips and tricks Introduction and Features of FoxPro Features of Multimedia Top 10 online services and applications Receiving S.M.A.R.T. status bad backup and replacing error Version Control System Uninstalling Software or Apps in Windows Data Warehouse Increase or decrease font size in Word using keyboard shortcuts Mouse not detected or working in Windows Computer Cleaning Information and Steps Function Keys on Keyboard Windows 7 Alt+Tab won’t stay on top or stick 10 Essential Examples of Web Browsers Binary Subtraction using 2’s Complement Case Sensitive Languages Computer Pioneers and people who are CEO Microsoft Word Shortcut Keys Parts of Computers Names, Definitions and Images ROM and its Types Basics of Information Technology Characteristics of a Good Software Design Characteristics of Management Information System Classification of Management Information System Implementation of MIS Input Devices of Computer Definition Limitations of Management Information System 3 Types Of Network in Computer Block Diagram Of Control Unit Difference Between Computer and Embedded System Difference Between Hard Disk and Floppy Disk Abstraction in OOAD Hardware and Software Devices Optomechanical Mouse CMOS Memory What is a Terminal? What is Graphic Design? What is Load? What is Passcode? What is Reboot? What is Registry? What is Safe Mode? What is Standby? What is SYN (Synchronize)? What is Task Manager? Attribute Computing BPS in Computer Bulletin Board System Light Pen Input Device 3 TYPES OF NETWORK IN COMPUTER Block diagram of control unit What is a Solid Ink Printer? What is a Temporary File? What is an App launcher? What is Backup and Restore? What is a Tab Character? What is the Core i3? What is Paint? What is a Workbook? Advantages and Disadvantages of Online Education What is a String? What is a VDU (Visible Display Unit)? 50 Uses of Computer What is Workspace? What is a Procedural Language? What is VGA (Video Graphics Array)? Object Linking and Embedding in MS Word Semiconductor Memory Types of Parallel Computing Web Resources Difference between Virus, Worm and Trojan Horse Difference between HQ (High Quality) and HD (High Definition) What is Text Wrapping What is Timestamp? Semiconductor Ram Memory What is a File Attribute? What is a Video Call? Difference between SDRAM and DDR What is ANSI? Difference between DOS and Windows How to Set the Path and Environment Variables in Windows? Mainframe System What is ScanDisk? C drive in Mac Computer Memory Table How to Change the Keyboard Language in Windows? What is a Video Call? What is a Zoom Slider? What is Floppy Disk in Computer What is the most Popular Operating System? OMR in Computer What is a Work Area?

What is a Command Key?

The Command key, also known as the "Beanie key", "Cloverleaf key", "fan key", "cmd key", "open Apple key", or simply "Command", is a key found on all Apple keyboards. It was designed by Susan Kare, a graphic designer responsible for the original Macintosh computer's user interface.

What is a Command Key

The Command key is located at the bottom of the keyboard, next to the Control and Option keys. A small picture of an Apple logo or a stylized four-leaf clover represents it. The key is combined with other keys to perform various functions in the Mac operating system.

One of the main functions of the Command key is to provide keyboard shortcuts for commonly used commands. For example, the Command + C shortcut is used to copy selected text, while Command + V is used to paste it. Other shortcuts include Command + A for selecting all text, Command + Z for undoing the last action, and Command + Q for quitting an application.

In addition to providing shortcuts, the Command key is used for various system-level functions, such as switching between open applications, accessing the Dock, and accessing the Spotlight search feature.

If you need help with the Command key, it is important to check that your keyboard is properly connected to your computer and that your Mac's operating system is up to date. Some third-party software may also interfere with the functionality of the Command key.

For Windows and Linux users, alternative keys can be used instead of the Command key. The Windows key on Windows keyboards and the Super key on Linux keyboards serve similar functions as the Command key on Mac keyboards.

The functionality of the Command key:

The Command key is found on all Apple keyboards that serve multiple Mac operating system functions.

One of the primary functions of the Command key is to provide quick access to commonly used commands through keyboard shortcuts. For example, the Command + C shortcut is used to copy selected text, while Command + V is used to paste it. Other shortcuts include Command + A for selecting all text, Command + Z for undoing the last action, and Command + Q for quitting an application.

The Command key is also used for various system-level functions, such as switching between open applications, accessing the Dock, and accessing the Spotlight search feature. These functions can be accessed by using the Command key in combination with other keys or by using menu options while holding the Command key.

It is also used to access certain applications' contextual menus and navigate through the Mac OS's various menus. On some applications, it can also be used to access preferences, settings, and other options.

In summary, the Command key is a powerful tool for quickly accessing commands, navigating through the Mac OS, and controlling various aspects of applications. Mac users need to provide quick and efficient ways to manage their computers.

Using the command key in Mac:

The Command key is an important part of the Mac operating system (OS) and is combined with other keys to perform various functions. Here are some examples of how the Command key can be used in Mac OS:

Keyboard shortcuts: The Command key is often combined with other keys to perform common tasks quickly. For example, Command + C is used to copy selected text, Command + V is used to paste it, Command + A is used to select all text, Command + Z is used to undo the last action, and Command + Q is used to quit an application.

Switching between open applications: The Command + Tab shortcut is used to switch between available applications. Pressing and holding the Command key, then pressing the Tab key, will bring up a list of open applications. You can then release the Command key and press the Tab key to switch between them.

Accessing the Dock: The Command + Option + D shortcut hides or shows the Dock. This allows you to quickly access the Dock and any open applications, folders, or files that are located there.

Accessing the Spotlight search feature: The Command + Spacebar shortcut opens the Spotlight search feature. This lets you quickly search for files, applications, and other items on your Mac.

Accessing the contextual menu: The Command + click or right-click is used to access the contextual menu of certain applications. This allows you to access options specific to the selected item or element.

Accessing the preferences and settings of an application: The Command + (comma) is used to access the preferences and settings of an application. This allows you to customize the behavior and look of the application. These are just one or two examples of how the Command key can be used in Mac OS.

There are many other shortcuts and functions that can be accessed using the Command key, and it is an essential tool for navigating and controlling the Mac OS.

The Apple Command key is a modifier on all Apple Macintosh computers, and it is combined with other keys to perform various actions, commonly known as keyboard shortcuts. These shortcuts allow you to quickly access different functions and features of the computer, such as copying and pasting text, opening and closing applications, and navigating through menus.

Some examples of common keyboard shortcuts using the Command key include:

  • Command+C: This shortcut is used to copy the selected text or object. When pressed, it copies the selected content to the clipboard, allowing you to paste it elsewhere with the Command+V shortcut.
  • Command+V: This shortcut is used to paste the current content on the clipboard. When pressed, it inserts the copied range at the cursor's current location.
  • Command+Z: This shortcut is used to undo the last action. When pressed, it undoes the previous action performed, allowing you to quickly fix mistakes or change your mind about a move.
  • Command+Tab: This shortcut is used to switch between open applications. When pressed, it brings up a list of available applications, allowing you to switch between them quickly.
  • Command+A: This shortcut selects all the text or objects in a document or window. When pressed, it highlights all the content in the current document or window, making it easy to copy or delete.

Overall, the command key is an important tool that allows you to navigate and control your Mac computer quickly and easily. It's a great way to increase your productivity and streamline your workflow.

Troubleshooting in command key:

If you are experiencing issues with the Command key on your Apple Macintosh computer, here are a few steps you can take to solve the problem:

Check the physical condition of the key: Inspect the key to ensure it is not stuck or damaged. Clean the key if it appears dirty, and try using it again.

Restart your computer: Sometimes, a simple restart can resolve software-related issues. Shut down your computer and wait a few seconds before turning it back on.

Update your operating system: Make sure your operating system is up to date by checking for software updates. Move to the Apple menu and select "Software Update" to see if any updates are available.

Adjust keyboard settings: Go to the Apple menu and select "System Preferences," then "Keyboard." Ensure that the "Use all F1, F2, etc. keys as standard function keys" option is not selected.

Check for third-party software conflicts: Some software can interfere with the Command key's function. Try disabling or uninstalling any recently installed software to see if that resolves the issue.

Verify keyboard language settings: Ensure the keyboard language is set to the correct one, as sometimes incorrect language settings can cause issues with the command key.

Try resetting NVRAM or PRAM: NVRAM and PRAM store settings for many of your Mac's functions. Resetting it can help fix the issue, and you can follow the instructions on the Apple support website.

If the above steps don't resolve the issue, you can contact Apple support or take your computer to an authorized repair center.

Only some of these steps may apply to your problem, but it's always a good idea to rule out the basic troubleshooting methods before moving on to more complex ones.

An alternative command key:

On Windows and Linux systems, the equivalent of the Command key on an Apple Macintosh computer is the "Control" (Ctrl) key. The Control key is often used in keyboard shortcuts, such as Ctrl+C to copy or Ctrl+V to paste. Some examples of common keyboard shortcuts that use the Control key on Windows and Linux include:

  • Ctrl+A to select all text or items
  • Ctrl+Z to undo an action
  • Ctrl+X to cut selected text or items
  • Ctrl+S to save a document
  • Ctrl+P to print a document
  • Ctrl+F to find text within a document

It's worth noting that some keyboard shortcuts on Windows and Linux may vary by application or program, so it's always a good idea to check the program's documentation or menu options for specific shortcuts.


In conclusion, the Command key, also known as the "Apple key," is a key found on Apple Macintosh computers that are used in keyboard shortcuts. It is combined with other keys to perform various actions, such as copying and pasting text and opening contextual menus. On Windows and Linux systems, the equivalent of the Command key is the "Control" (Ctrl) key. Both keys are used in keyboard shortcuts to perform common actions such as copying, pasting, saving, and undoing actions. Suppose you are experiencing issues with the Command key on your Apple Macintosh computer. In that case, you can try several troubleshooting steps, such as restarting your computer, checking for software updates, and adjusting keyboard settings.