For example , you push Ctrl+V and insert the buffer content into the window. How can I create my own hotkeys like that? Sorry for noobish question.
You can create a simple hotkey in Windows by creating a shortcut and then assign a shortcut key to it. I have done this for launching some command line apps with parameters. The following link explains using a shortcut key to an app to mute the volume:Mute
Just replace the Target: and Shortcut Key: in the shortcut properties with whatever you need for your purposes.