Java EE (Java Enterprise Edition) General Discussion

I've been reading all day and I must really be missing something very basic, regarding the use of ActiveMQ.

I installed ActiveMQ on a computer here, and it's working fine. Now on a second computer, I'd like the write myself a trivial Java program to connect to the ActiveMQ instance and either send or read messages. All the text written on connecting to ActiveMQ seems to revolve around the use of other facilities in addition.

What's the simplest way to access the ActiveMQ server from a trivial, remote Java program? Where does the javax.jms package, if that is the thing to use, come from? Do I need a whole additional service installed on the client to use ActiveMQ?

I must be missing something obvious, because doesn't seem to be any information on this?

Thank you.