I didn’t want to demean anyone’s Max Payne thread with this silly question so:

I can’t remember what key to use to activate the scope on the sniper rifle. Dumb, I know.
Every site I looked at will give you cheats, walkthroughs, command line tweaks, etc. but no control listing. It only just occurred to me today to look at the options menu on the game, but I’m at work and I’m not positive that it would show that control as the game tells you when you first pick up the rifle (for a split second and never again).
If anyone who has this on PC can spare a second, I would be muy grateful.

Can't you just go to the key mapping screen?

I can't help you, I re-mapped ALL the controls the day I got it. But, I can tell you it's in the configuration menu. Hope that helps.

I haven't played it in a while, but I think you have to hold on ENTER. It will keep zooming until you let go.

Play the tutorial level, it tells you how to do it.

isn't it the "E" key? i think "E" is the "use" key and when you have the rifle it zooms in.

All Riiight!
Thanks you guys!
Now I know I can go home and teach those thugs a lesson (from reeaaalllly far away).