install 2 servers on AIX

A question from a customer:

They have their test RTC server (5.02) on AIX (Tomcat x DB2). They would like to setup a 6.0 or 6.01 test server in addition to the 5.02 one. It would use Liberty x Derby.

1/ Is it possible to install 2 servers through Installation Manager (probably with response file)?

2/ Is it the same level of IM, a separate install of IM ?

3/ any advice for the response file contents ?

Thanks !

Nicolas