Client/Server between Delphi 3 and Unix

this is comp.lang.pascal.delphi.databases, right? I would suggest using a
database server on UNIX if it's about pure data.

If it is about raw things like numbers'nstuff, TCP/IP in Delphi 3 C/S is
native since the two controls are VCL.

Doing TCP/IP requires you to write your own application interface to it,
meaning you'll have to do some C coding on the unix machine to get it to
provide the right information in the right way thru the TCP/IP..

Anyway... it's not too hard but it's a lot of work.