release accelerator from memory while program still running

Is it possible to release accelerator (e.g. PrintScreen)
when program is still running? Like when Fatal Error occurs
and you want to create PrintScreen of the error message,
but it is not possible because the key is reserved for program. So I cannot press PrintScreen and then paste it to mspaint and save the message. For this case I would like to release the PrintScreen not to be used by the program anymore.
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