Connecting across internet

If I want to connect to a Postgresql server on the internet, how do I do it?

What protocol do I use? How do I send commands? etc.

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Patrick Dunford, Christchurch, NZ - http://pdunford.godzone.net.nz/
  Therefore, since we are receiving a kingdom that cannot be
shaken, let us be thankful, and so worship God acceptably with
reverence and awe, for our "God is a consuming fire."   -- Hebrews 12:28-29
http://www.heartlight.org/cgi-shl/todaysverse.cgi?day=20001228
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