dynamic IWHOME in DCT

System

In a DCT inline, if I have a path to a script or pass a script a parameter that is a path file, and the path includes L:\iw-home, is there some symbol I can put in the DCT instead of L:\iw-home that makes it dynamic instead of hard-coding it? I think that IWHOME will be the same on the DEV, QA and PROD TeamSite servers, but I can't be sure, and if it weren't, how would this issue be addressed?

Everywhere else in all code (except some .cmd files) IWHOME is not hard-coded. Does anyone know how to set IWHOME dynamcially in a batch file (other than using an environment variable)?

Thanks in advance.