Use application's window title
I'm using ISBoxer for EVE Online. EVE Online has a tool, Slazanger's Map Tool, that uses the window title to track which character you're focused on, and switch the map based on that character's location etc. By default, it doesn't work with ISBoxer, because ISBoxer sets the window title to is1, is2, etc, when SMT is expecting "EVE - Character Name", which is the default window title for the game. I've managed to get around this by setting a custom window title for each slot in the character set, to "EVE - {CHARACTER}". This still isn't optimal, however, as it only works for one character per account unless I want to make a bunch of different character sets for when I switch to my other characters, which would also require restarting the clients etc. A simple way to make this easier is for ISBoxer/InnerSpace to have an option to mimic the application's window title (this would require that InnerSpace update the window title when it changes, as well). This way, SMT would work seamlessly regardless of which character I was actually logged into on that slot.