Ups_mond

Hello everyone,
I have the ups_mond daemon running on my hpux 11.00 and want to instruct it to execute a shell (not /sbin/shutdown) when an AC failure occurs.
Does anybody know how to do it ??...I have read the docs and everything points only to ups_conf file (which is useless for this action), and that ups_mond can be executed with options "t" and "s", both useless as well.

Thanks in advance,
Cristian.