It's a shame no one has answered. I'm a beginner, but here's what I can tell you.
Run a command window pointed to your python installaion\Scripts folder. tabpy.exe should be in there. You start the server by running "tabpy" (see below). If it runs, the last line in the command window should read,
..."Web service listening on port 9004"
P.S. I might be making lots of assumptions about your environment.
Thanks for the answer Will!
Stephanie Julia Valenzuela were you able to get your TabPy instance running again? It looks like it may have been shutdown if nothing else changed and it suddenly stopped working.
One additional note, when you install TabPy, the keyword tabpy will get added to your environment, so you don't need to navigate to the directory to call it.