did 3dgs create multi- thread by lite_C ,any one have good ideas?
I want to create Socket listen thread into 3dgs in client.so if i can call dll to run thread will be a greate job.

You can use CreateThread directly from Lite-C:
http://msdn.microsoft.com/en-us/library/windows/desktop/ms682453%28v=vs.85%29.aspx

Thank you ,guys i aleray know that.