Your MK605 keyboard has a row of F-keys above the number keys. The F-keys have two states:
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Normal: F-keys in their normal state can be programmed to perform a variety of tasks. To use F-keys in the normal state, press the F-key you wish to use.
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Enhanced: The F-key will send a pre-programmed command (ie. Print) when the F-key is pressed simultaneously with the FN key (shown below).

The Enhanced functions can be changed in the Mouse and Keyboard software (SetPoint) as described in Knowledge Base article 360023217314.
Please see the following for a description of the Enhanced functions of the F-keys:
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Web browser |
Media application |
Mail application |
Previous track |
Windows® search |
Play/Pause |
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Next Track |
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Mute |
Print Screen |
Volume down |
Pause/Break |
Volume up |
Contextual menu |
Sleep mode |
Scroll lock |
Important Notice: The Firmware Update Tool is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
Important Notice: The Logitech Preference Manager is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
Important Notice: The Logitech Control Center is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
Important Notice: The Logitech Connection Utility is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
Important Notice: The Unifying Software is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
Important Notice: The SetPoint software is no longer supported or maintained by Logitech. We highly recommend using Logi Options+ for your supported Logitech devices. We are here to assist you during this transition.
Frequently Asked Questions
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Web browser
Media application
Mail application
Previous track
Windows® search
Play/Pause
Wiindows calculator
Next Track
Mute
Print Screen
Volume down
Pause/Break
Volume up
Contextual menu
Sleep mode
Scroll lock