In our shop we have a number of Oracle instances that are all recognizable from a particular Unix box that I'm working on. So, if I can login to an instance on another machine as follows,

sqlplus username@dbname/passwd

how can I use this remote instance in a Pro-C program? The precompiler wants to use whatever the default Oracle database is, and that's local. How can I make the remote database my default SID for compiling and running this program?

The reason I'm using this particular machine for developing my program is that I don't even have logon access to the remote machine that houses the database.