How can we find the log & out files of concurrent Requests?

How can we find the log & out files of concurrent Requests?
or
 what is the location of log & out files of concurrent Requests?

From Back end :
Log file Locations:  $APPLCSF/$APPLLOG
Out File Locations: $APPLCSF/$APPLOUT

Each log file and out file related to each request is identified with that request id.

From Front End:
Navigate to System Administrator --> Concurrent-->Requests-->find [button]
Log file: Click on view log button
Out file : Click on view output button

Using SQL:
Connect to sqlplus as 'apps' user
SQL>@$FNS_TOP/sql/afcmcreq.sql

Then it will promts for the request id . By using this we can view only log files.