For UNIX:
Look for the following lines in your bpstart_notify andbpend_notify scripts and add the absolute path of custom script file as shown below.
<SNIP>
# --------------------------------------------------------------------
# main script starts here
# --------------------------------------------------------------------
/<custom_script_directory>/custom_script <---- Add this line, absolute path to your script
umask 022
if [ "$#" -ne 5 ]
then
exit 1
fi
</SNIP>
taken from
