How to rum QCMD from cmd window for different quartus version

hii all,

i have three version of quartus installed with me , quartus 9 quartus 11.1 and quartus 12.1. this is because some old projects are done on these version and time to time bug fixatures require to use corresponding quartus version.

now when i am trying to open quartus from cmd by using command qcmd it only opens for quartus 11.1 but i want to open version 9 . searched many places for method to open qcmd for corresponding version when u have two or three diff version but never found a method.

plz reply if any of u have any reply.