There are 45 signals in all. Starting from SIGHUP no 1 to SIGRTMAX no45.Check Sun link below:http://developers.sun.com/solaris/articles/signalprimer.html
"ps -aef" must be good I guess..For some services known you would use something like below..ps -aef | grep -lp ... lpd daemon would be running for printer servicesps -a...