Enabling 2 enteries to project using threads

OP replied:
With TCP channel

Not worked with tcp channel but after a google I can't find information relating to concurrency in its configuration. I would suggest, assuming this is a single process, that you add thread safe code with a usage counter, increment the counter at the entry point on the remote method. Decrement the count on the exit and throw and exception if you're at your desired limit. Although it's much easier with WCF and web services as you can limit users using the concurrency and instancing settings in the configuration or the web gardening settings in IIS.