Sample Client/Server code using ScktComp in D7

Does anybody know a good source for sample code to provide both client and
server behaviour in one program.  There are several of these applications
running on a network and each must talk to the other with no central server.

I've got most of it going but every so often get a fatal Access Violation with a
garbage address.  I suspect multi-threading problems but can't see any reason
for them.

I'm reluctant to recode it all using Indy or somesuch - it's so very nearly
there.

TIA

Don.