Lan Connection

Questions??
 The SQL and Programming part are easy!
But.. I can't connect to a database on the lan
only on the local machine..
Scenario..
  Created test DB called mydb
  Created table person w/ fields (name, address, city, state, zip)
  Inserted values into tables
  Table displays on local serves with Select query..

I want to run Postgres server on host Maintower then
I want to connect to database mydb from host user Laptop
TCP/IP and Named Resolution are up and running....

What syntax do I use ..?

Bob T