Ports()
FUNCTION: 
ports(<player name>)
This function returns the list of descriptors ("ports") that a player, specified by full player name, or by dbref, is connected to. Wizards can use this function on anyone, but mortals can only use it on themselves.
If the <player> is not connected, an empty list is returned. Otherwise, a list of ports is returned in order of most recent connection to least recent connection. These ports correspond to those given by the SESSION command.