Input text at the cursor (in any window)

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http://askubuntu.com – I need to be able to input some text (constant) at the cursor of any window by pressing a defined shortcut (I know this is specific to a window manager, so this isn't part of the question). I.e. I'm making a comment on a site, want to add my signature, press a shortcut and the signature is pasted at the cursor. This must not be app-specific. Suggestions appreciated. (HowTos)