ORACLE APPS : Concurrent manager Basic :Where is log and out files ?

The concurrent manager first looks for the environment variable $APPLCSF
If this is set, it creates a path using two other environment variables:
$APPLLOG and $APPLOUT
It places log files in $APPLCSF/$APPLLOG
Output files go in $APPLCSF/$APPLOUT
So for example, if you have this environment set:
$APPLCSF = /u01/appl/common
$APPLLOG = log
$APPLOUT = out
The concurrent manager will place log files in /u01/appl/common/log, and
output files in /u01/appl/common/out
Note that $APPLCSF must be a full, absolute path, and the other two are
directory names.
If $APPLCSF is not set, it places the files under the product top of the application associated with the request. So for example, a PO report would go under $PO_TOP/$APPLLOG and $PO_TOP/$APPLOUT
Logfiles go to: /u01/appl/po/9.0/log
Output files to: /u01/appl/po/9.0/out
Of course, all these directories must exist and have the correct permissions.
Note that all concurrent requests produce a log file, but not necessarily an output file