F13 is the PrintScreen (PrtScn) button. I think the original poster is cryptically pointing out a hotkey combination that prints the active window into your clipboard (instead of the entire screen). However, this can be done using the simpler Alt-PrtScn. To review:
* PrtScn: prints the whole screen into your clipboard
* Alt-PrtScn: prints the active window into your clipboard
:D I posted this as a joke. One of my coworker got me searching on google by mistrust. It took me at least 2 minutes before I realize there was no F13 key.
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[ 5.1 ms ] story [ 26.6 ms ] thread(Mac user here)
* PrtScn: prints the whole screen into your clipboard
* Alt-PrtScn: prints the active window into your clipboard
* Ctrl-Alt-PrtScn: same as Alt-PrtScn