Multiple Versions of Intel MPI Library Runtime on one machine

Hi Intel we appreciate all the time and effort you put into your products. We have a question about installing multiple versions of the Intel MPI Library Runtime Environment on one machine.

How can one have multiple versions of the Intel MPI Library Runtime Environment installed on the same machine? We are asking because some versions of our software use 4.0 and some use 4.1. In the near future another version may use 5.0. There seems to be a conflict because the Windows services all use the same name. 

Thanks for the great products,

Adam Bruss