Messaging to a Service

Here's my condundrum. I have some VB applications that are executed on
the PC under a specific user ID. The invocation is via rexec, so the
user id is passed in. A normal user has little authority, and they
don't have the authority to run these applications. So I was thinking
of creating a service that would run under the priveleged user and
execute the applications for the unprivledged user.

Question: How do I send a message to the service? I could do something
like changing a file and having the service poll the file, but that
seems 'busy'. I guess I could do it with sockets, but that seems like
more effort than I want to spend. What I really want to do is have the
service wait on a data queue <smile>. 

All ideas appreciated...