A guy gets into an unattended computer and gets killed with a gun for it. A detective or maybe a thriller.

[Strannik27]

Looking for one book. I only remember the beginning of the piece. Some guy found a derelict computer, sat down at it and started doing something, and then he saw a man with a gun walk up to the desk, they looked at each other in silence for a while, then the guy mechanically pressed the Enter button and the man shot him back. The work was read in the 1990s or very early 2000s.
Appears to be either a detective or a political or spy thriller, but I'm not sure.
The piece appeared no later than the 1990s (probably earlier). I also remember that the guy was doing something enthusiastically on the computer: at first he typed without looking at the screen, but the message on the computer monitor made him do his work more slowly and carefully. The phrases went something like this. The message on the computer screen made him work more carefully. Behind the desk stood a man with a gun in his hand. The guy had never seen a real gun, except in the movies, but he knew immediately what it was. The guy's hand dropped mechanically to the Enter button, and the same second the black muzzle of the gun burst into flames, ending his life.