It shouldn't matter whether you have the retail version or the Steam version; both should both work fine, just make sure you're patched up to the latest version.
wasd to move, double tap to sprint, hold shift (or double tap to toggle) to walk while moving
q and e to lean left and right (double tap to toggle) (roll when prone)
alt to look around without moving the gun
z to go prone
x to crouch
c to stand up
v to hurdle over things (like fences)
b to use binoculars
n to use night vision
m to use map
g to open inventory
k to use compass (double tap to toggle)
f to change firing mode
o to use clock (double tap to toggle)
/ to chat
r to reload
[ ] to scroll through various actions (such as getting in a vehicle or switching weapons)
space to bring up the command menu for all AI squad members (individuals can be selected with the f1, f2, f3, ect keys)
----------- use numbers to cycle through the various commands for AI squad members
left mouse click to fire
hold right mouse click to zoom in (non-scoped)
click right mouse to scope
----------- while scoped with an ironsight/reflex scope to zoom in
ctrl (double tap to toggle) to lower rifle
q to turn on vehicles/throttle
z to descend (helicopter) (and I think air break in a plane, though I'm not 100% sure off hand)
Thanks for all of the feedback guys. Much appreciated
Most likely going to get Arma II Combined Operations today, but if not on Saturday or Sunday. But like I said, on disk because I have a $50.00 gift card for EB Games and it's only $28.00 so...you know, makes sense to use it on something you really want, hehe.
Well, I have it on disc (Bought it before it came on steam), and DayZ works fine.
I like DayZ, but make sure you try out normal Arma 2 too (or with the A.C.E Mod) , Great game on its own as well, if you like military simulators (Though it does have it's quirks). Pretty realistic flight model too, sadly I seem to be one in like 500 (Probably more than that but eh ) that can fly decently (In DayZ that is), Though I did play Arma 2 for like 2 years before DayZ came out, so I've had plenty of practice .