I don't know if it 's the correct forum....

I have novell 6.5sp6 and I' d like know when someone connects some apparatus on my internal lan.
For example when a new pc is connect to lan into DHCP screen appears the new mac address, but I must look always this screen.
Is it possibile to sent an email to the administrator?

is there a free software that can do this?
Even if is not for novell , perhaps someone to know a software that run on windows XP and can do this.

Please can someone give me suggestions?