DIR_EXE_ROOT

Hi everyone,

I am having a basic doubt, where are the parameters DIR_EXE_ROOT,DIR_INSTANCE, DIR_INSTALL defined in a sap system?

SAP Note 1104735 is mentioning about a new direcotry structure for unix systems and we have already made the requested changes . But after th\e change , DIR_EXE_ROOT is pointing to a wrong directory and need to know the possible cause of this change.

Thanks

Aby