I purchased the Stardock Humble Bundle almost specifically for Multiplicity so that I could share the keyboard/mouse between my main computer and my work computer.  I was previously using Synergy which was a bit buggy and was hoping this would be better.  The only problem I have so far is that it seems to need Steam running at all times (shortly after I closed Steam it gave me a message that it wasn't licensed).

Is it at all possible to apply a license that won't require Steam to be running without purchasing another copy?  I would like to avoid having to keep Steam running on my work computer if possible since I was already nervous enough about installing it in the first place.

Edit: Forgot to mention that I do have Steam running on the main (primary) computer.  My work computer is configured as the secondary.