The CTREE_CONF environment variable specifies the full path to the configuration file. If CTREE_CONF is not defined, FairCom RTG searches for a file named ctree.conf in the current directory (the directory of execution of the user application that loads FairCom RTG).
Windows
set CTREE_CONF=C:\MyConfigFiles\my.ctree.cobol.conf
Unix
CTREE_CONF=/etc/MyConfig/my.ctree.cobol.conf
export CTREE_CONF