How does remote client connect to 5.10 online server

I'm a seasoned Online 7.x veteran, but I've been asked to work with, ahem, online 5.10. All my training on 7.x seems not to pan out on 5.10. I've been able to connect locally using dbaccess, I'm trying to connect 5.10 Online server, remotely using dbaccess. I believe I need I-NET to make this happen, but unfortunately I don't have any manuals(for 5.X) I-NET, which can aid me. So my humble questions are.. 1. Does I-NET have it to be installed on client as well as on server, or client alone? 2. We've modified /etc/services, /etc/hosts.equiv,.. the network related system files, with no effect. (We found no $INFORMIXDIR/etc/sqlhosts; Is it used by 5.X?) 3. We tried 5.x DBPATH, SQLEXEC, DBNETTYPE, SQLRM, SQLRMDIR with little effect. Any clue to what missing environment variables we need on client as well as server side? TIA, one stuck, frustrated engineer. jubal@sequent.com (503) 578-4291