hi how to set entironment variable in CFX pre
 

(Transient Mesh Adaption Setup for CFX-5.7 Pre

The following notes explain how to setup and run a transient mesh adaption case in CFX-5.7 using a specially patched version of CFX-Pre. The patch contains 5 files that should be copied into the appropriate places in the CFX installation, and is activated by setting the environment variable CFX5_TRANSIENT_ADAPTION=1. If this variable is not set, then Pre will behave exactly as the release version and you will be prevented from using the Adaption form with transient cases.)

when i want to set environment variable , would you tell me how to realize ?