Search for a book by description

Hi. Looking for a book, apparently a detective or thriller (fairly old, no later than the 1990s edition). I only remember the beginning of the work. Some guy found a derelict computer, sat down at it and started to do something there and then he saw a man with a gun walk up to the desk, the guy automatically pressed the enter button and the man shot him back. Who remembers the piece please sign off.

I think that the intended place for such queries is at the "You Know That Show..." page.