RePete has it entirely right, one tag equals one deer.
But I think SignGuy is asking about a hunter with two tags. The regular tag, if it is NOT annotated "antlerless" is good for a buck anywhere in Ontario during the general open season, archery or rifle, shotgun, muzzle loader, whatever. (It is NOT valid for controlled hunts!!!)
A tag with an antlerless validation is good for anything (buck, doe, fawn) BUT ONLY IN THE WMU FOR WHICH IT IS VALID. That antlerless tag is WMU-specific, and as soon as you are hunting out of that WMU it is a buck tag only.
Doug