From a technical stand point, as long as your two machines do not attempt to access the same shared file, there will be no problem. If you were to do this, FileMaker just displays an error message on the second machine and quits.
I'm not a lawyer nor do I represent FileMaker Inc. in any official capacity, but I think the user license permits you to have one install for use and a second "back up install". When you are developing at home, your work computer would be your "back up install". When you are developing at work, the reverse would be true. Reacy your license agreement and see what it says.
Thanx... purchased FM Pro Adv already. Now it is time to put hands on this. Will try to make the development on the office's machine.