If you want a character logged in sitting in the game world, then not without some extra help.
They have a timed monitor, which is updated when any input is made to the game via any HID. It can be manipulated with the right program, but as it needs to read/write to game memory, they tend to be against the rules.
Another option is to use a macro program of some kind to cycle the windows and press a key (or wiggle the mouse). There are a few decent choices out there, but as the games usually need to be the focused window for this to work, then it does get a bit annoying if you happen to be using the computer for something else at the time, and you also need to be able to disable it easily when you do want to play, for the same reason.