Who's logged on when 'w' or 'who' won't work

Sometime you can't use 'w' or 'who' to see who's logged on. Some dodgy tools don't update 'wtmp' when they spawn a shell for a connecting user. Opsware is such a tool. In such cases you need to find processes with controlling terminals to see who's logged on

• HPUX & Solaris

ps -ef | egrep 'pts/[0-9a-z]' | grep -v $$

• AIX (less than perfect, but a start)

ps -efo pid,ppid,user,tty,args | awk '$4!="-" {print}' grep -v $$

I have not idea how to communicate with them once you find them since wall won't work :~(