How do you program the Function keys - Logitech Cordless Desktop EX110

I think you need to be in Programming Mode with the Programming Key.

https://www.google.com/search?q=sam4s+er-900+programming

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Function keys are special keys used for assigning program shortcuts and specialty tasks to the keyboard.
They are located at the top of most keyboards and labeled "F1" through "F12."
Some keyboards may only feature 10 function keys, while others may have as many as 18. These keys often go unutilized by the average computer user, but they may have very important tasks for some users, which can lead to problems when the keys do not respond.
Fixing nonresponsive or malfunctioning function keys is quite simple, and should only take a few minutes.

Connect your keyboard to your computer, and power it up.
Open a program that uses the function keys such as Microsoft Word or Microsoft Excel. Check your keyboard for an "F-Lock" or "Function Lock" key.
This key is used to toggle function-key support; when it is toggled on, the function keys will not work.
Press the "F-Lock" key and then try using a function key in the selected program. "F1" is a good key to test, because it is set to open a "Help" document in all Microsoft software.
If the key does not work, press the "F-Lock" key a second time, and test the keys again.
If the keys still do not work and you are running the Windows 7 operating system, you may need to install a "hotfix" from Microsoft to fix the key functionality.
Navigate to the link entitled "Microsoft Support: Some Function Keys do not Work Correctly." (See Below.)
Some function keys or keyboard shortcuts do not work correctly on a computer that is running Windows 7
http://support.microsoft.com/kb/975741
Resolve unexpected Function (F1 - F12) or other special key behavior on a Microsoft keyboard
http://support.microsoft.com/kb/894513
Click on "View and request hotfix downloads" located beneath the title of the article to access the Microsoft Hotfix database.
Agree to the terms and conditions, then download the hotfix.
When the download is finished, run the downloaded file and follow the on-screen instructions.
You may need to restart your computer after the installation is complete.
Your function keys should now work properly.

Function keys are special keys used for assigning program shortcuts and specialty tasks to the keyboard.
They are located at the top of most keyboards and labeled "F1" through "F12."
Some keyboards may only feature 10 function keys, while others may have as many as 18. These keys often go unutilized by the average computer user, but they may have very important tasks for some users, which can lead to problems when the keys do not respond.
Fixing nonresponsive or malfunctioning function keys is quite simple, and should only take a few minutes.

Connect your keyboard to your computer, and power it up.
Open a program that uses the function keys such as Microsoft Word or Microsoft Excel. Check your keyboard for an "F-Lock" or "Function Lock" key.
This key is used to toggle function-key support; when it is toggled on, the function keys will not work.
Press the "F-Lock" key and then try using a function key in the selected program. "F1" is a good key to test, because it is set to open a "Help" document in all Microsoft software.
If the key does not work, press the "F-Lock" key a second time, and test the keys again.
If the keys still do not work and you are running the Windows 7 operating system, you may need to install a "hotfix" from Microsoft to fix the key functionality.
Navigate to the link entitled "Microsoft Support: Some Function Keys do not Work Correctly." (See Below.)
Some function keys or keyboard shortcuts do not work correctly on a computer that is running Windows 7
http://support.microsoft.com/kb/975741
Resolve unexpected Function (F1 - F12) or other special key behavior on a Microsoft keyboard
http://support.microsoft.com/kb/894513
Click on "View and request hotfix downloads" located beneath the title of the article to access the Microsoft Hotfix database.
Agree to the terms and conditions, then download the hotfix.
When the download is finished, run the downloaded file and follow the on-screen instructions.
You may need to restart your computer after the installation is complete.
Your function keys should now work properly.

Function keys are special keys used for assigning program shortcuts and specialty tasks to the keyboard.
They are located at the top of most keyboards and labeled "F1" through "F12."
Some keyboards may only feature 10 function keys, while others may have as many as 18. These keys often go unutilized by the average computer user, but they may have very important tasks for some users, which can lead to problems when the keys do not respond.
Fixing nonresponsive or malfunctioning function keys is quite simple, and should only take a few minutes.

Connect your keyboard to your computer, and power it up.
Open a program that uses the function keys such as Microsoft Word or Microsoft Excel. Check your keyboard for an "F-Lock" or "Function Lock" key.
This key is used to toggle function-key support; when it is toggled on, the function keys will not work.
Press the "F-Lock" key and then try using a function key in the selected program. "F1" is a good key to test, because it is set to open a "Help" document in all Microsoft software.
If the key does not work, press the "F-Lock" key a second time, and test the keys again.
If the keys still do not work and you are running the Windows 7 operating system, you may need to install a "hotfix" from Microsoft to fix the key functionality.
Navigate to the link entitled "Microsoft Support: Some Function Keys do not Work Correctly." (See Below.)
Some function keys or keyboard shortcuts do not work correctly on a computer that is running Windows 7
http://support.microsoft.com/kb/975741
Resolve unexpected Function (F1 - F12) or other special key behavior on a Microsoft keyboard
http://support.microsoft.com/kb/894513
Click on "View and request hotfix downloads" located beneath the title of the article to access the Microsoft Hotfix database.
Agree to the terms and conditions, then download the hotfix.
When the download is finished, run the downloaded file and follow the on-screen instructions.
You may need to restart your computer after the installation is complete.
Your function keys should now work properly.

Step 1:
Function keys are special keys used for assigning program shortcuts and specialty tasks to the keyboard. They are located at the top of most keyboards and labeled "F1" through "F12." Some keyboards may only feature 10 function keys, while others may have as many as 18. These keys often go unutilized by the average computer user, but they may have very important tasks for some users, which can lead to problems when the keys do not respond. Fixing nonresponsive or malfunctioning function keys is quite simple, and should only take a few minutes.

Connect your keyboard to your computer, and power it up. Open a program that uses the function keys such as Microsoft Word or Microsoft Excel. Check your keyboard for an "F-Lock" or "Function Lock" key. This key is used to toggle function-key support; when it is toggled on, the function keys will not work. Press the "F-Lock" key and then try using a function key in the selected program. "F1" is a good key to test, because it is set to open a "Help" document in all Microsoft software. If the key does not work, press the "F-Lock" key a second time, and test the keys again. If the keys still do not work and you are running the Windows 7 operating system, you may need to install a "hotfix" from Microsoft to fix the key functionality. Navigate to the link entitled "Microsoft Support: Some Function Keys do not Work Correctly." (See Below.) Some function keys or keyboard shortcuts do not work correctly on a computer that is running Windows 7 http://support.microsoft.com/kb/975741 Resolve unexpected Function (F1 - F12) or other special key behavior on a Microsoft keyboard http://support.microsoft.com/kb/894513 Click on "View and request hotfix downloads" located beneath the title of the article to access the Microsoft Hotfix database. Agree to the terms and conditions, then download the hotfix. When the download is finished, run the downloaded file and follow the on-screen instructions. You may need to restart your computer after the installation is complete. Your function keys should now work properly.

Function keys are special keys used for assigning program shortcuts and specialty tasks to the keyboard. They are located at the top of most keyboards and labeled "F1" through "F12." Some keyboards may only feature 10 function keys, while others may have as many as 18. These keys often go unutilized by the average computer user, but they may have very important tasks for some users, which can lead to problems when the keys do not respond. Fixing nonresponsive or malfunctioning function keys is quite simple, and should only take a few minutes.

Connect your keyboard to your computer, and power it up. Open a program that uses the function keys such as Microsoft Word or Microsoft Excel. Check your keyboard for an "F-Lock" or "Function Lock" key. This key is used to toggle function-key support; when it is toggled on, the function keys will not work. Press the "F-Lock" key and then try using a function key in the selected program. "F1" is a good key to test, because it is set to open a "Help" document in all Microsoft software. If the key does not work, press the "F-Lock" key a second time, and test the keys again. If the keys still do not work and you are running the Windows 7 operating system, you may need to install a "hotfix" from Microsoft to fix the key functionality. Navigate to the link entitled "Microsoft Support: Some Function Keys do not Work Correctly." (See Below.) http://support.microsoft.com/kb/975741 Click on "View and request hotfix downloads" located beneath the title of the article to access the Microsoft Hotfix database. Agree to the terms and conditions, then download the hotfix. When the download is finished, run the downloaded file and follow the on-screen instructions. You may need to restart your computer after the installation is complete. Your function keys should now work properly.

Hello earthaalford:
Your function keys are usually located on the top row and are labeled F1,F2,F3 and so forth. The function of those keys depends on what program you are currently operating in ie: Windows, Office , Word, Excel or any number of other programs.
Hope this helps, if it did just click the thumbs up.
Sincerely, Peter N.

I program my remote for my VCR like this: select function VCR - press the function key and the enter key at the same time and hold until the function indicator light starts flashing - enter the code (for my panasonic vcr that is 1004).

You need installer programming manuel.Yes to stay instant.

Your computer has a program on it called quick launch. It could be that the function key won't work until the program is loaded up into the memory of your computer.