Installing two versions of powerplay in same machine

[pathy]

Installing two versions of Cognos Powerplay (i.e. 7.1 and 7.3) in the same machine, will have any demerits?

(i.e. We gotta request from one of the user to install 7.3 in the prod server where 7.1 has been already installed and running)

Since the earlier version was configured and running fine till this point of time.

Is it possible to configure the version 7.3 along with 7.1 in Cognos Administration portal???? If possible, if i click powerplay in the portal which version it would take you too????