Open Server creates a site-handler thread when an Adaptive Server connects to an Open Server application.
Open Server creates a SUB-PROC when the Open Server application receives a server-to-server RPC. A SUB-PROC disappears when the server-to-server RPC completes. A site-handler thread disappears when the Adaptive Server closes its connection to the Open Server application.
An Open Server application only accesses a site-handler thread inside a SRV_CONNECT or SRV_DISCONNECT event handler. Site-handler threads are otherwise purely internal.
