
Your K350 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 Logitech Mouse and keyboard software (SetPoint) as described in Knowledge Base article 360023222334.
Please see the following for a description of the Enhanced functions of the F-keys:
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Launches Internet browser |
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Launches instant message application |
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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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Launches Internet browser
Launches instant message application
Program your favorite application, folder, or web site with a long, simultaneous press of Fn and the corresponding F4, F5, or F6 key (just like the presets of a car radio).