The variable $STAR will point directory to the release area you're in (e.g. if you're in "pro" which is currently sl98e, $STAR will point to $STAR_PATH/SL98e = /afs/rhic/star/packages/sl98e)
Each release directory (eg. $STAR_PATH/SL98e) contains the following structure (not exhaustive):
.$STAR_SYS - Platform-specific build area named as '.'
followed by the $STAR_SYS architecture name
(eg. i386_linux2, sgi_64, sun4x_56)
/bin/ - Binary Files
/dep/domain - Dependency files
/lib/ - Libraries
/obj/domain - Object files
kumacs
/chain - principal driver kumacs for several domains
/util - utility kumacs
/domain - principal driver kumacs for particular domain
pams
/domain - packages for each domain
/idl - table idl files
/inc - Include and header files used by more than one packag
/kumac - kumac files for each package
/package - package directories
params
/domain - parameter files, geometry, switches etc.
for each domain
Also used are files in
/afs/rhic/star/data = $STAR_DATA which contains data files.
See especially samples subdirectory.