2 pc's 1 copy?

I have 2 pc's do I need to buy 2 copies to play the game on both pc's or is there a way to run the game on both pc's at the same time with 1 copy. Have not even tried it yet just wondering. Thanks.

@bobby-doughnuts

Game is not shareware yet, so no. Maybe in 2035, no wait wolf 3d released 1994 is still costing money so probably not in a while longer. Steam sales will probably have a good discount when NWI releases the next game though=)