Its good that you seek to clarify your question...
Consider mainframes as one big system which is on a server side and has all the "intelligence", "database" etc and your terminal just a way to key in information to pass to that server and get the response back. Interaction between the two happens with different mainframes specific protocols. In case of web it happens with http protocol.
Regarding the medium...The installation of client includes with it all the necessary connection strings to server (mainframes)
Consider mainframes as one big system which is on a server side and has all the "intelligence", "database" etc and your terminal just a way to key in information to pass to that server and get the response back. Interaction between the two happens with different mainframes specific protocols. In case of web it happens with http protocol.
Regarding the medium...The installation of client includes with it all the necessary connection strings to server (mainframes)
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