waiting for specific key stroke

Hello,
I would like to ask for a help. How it is possible for the psychotoolbox wait for keyboard stroke of specific key (for example enter or letter 'p') and then continue with further operations. I found only KbStrokeWait , but this command is for any key , but I would like to know how it is possible for specific key. I tried to find the answer or piece of code with this, but I wasn´t successful. Thank you very much in advance.

Mara