adam,
what do you mean by "working on the same program?" Is it possible to
develop an application with more then 1 developer then the answer is yes
assuming you segragate the tasks and define interfaces and or use a tool
like Visual Source Safe.
If you mean can you install the application on a server and have multiple
users use the same windows-form application then I believe that the answer
is yes assuming that the appropriate dot.net security setting have been
made.
Dan