>..what is the server/cluster?
It is the instance of PostgreSQL that you have installed.
You can have multiple instances/copies of PostgreSQL on your PC,
each on a separate port #. If you only have one, it is usually on port 5432.
Melvin Davidson I reserve the right to fantasize. Whether or not you
wish to share my fantasy is entirely up to you. 
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From: Douglas Eckert <douglaseckertinpa@gmail.com>
To: Melvin Davidson <melvin6925@yahoo.com>
Sent: Tuesday, August 9, 2016 11:13 AM
Subject: Re: [pgadmin-support] pgadmin3 - Tables?
PS, what is the server/cluster?
Doug