NickServ:GHOST

From EScriptIRC, The IRC-related documentation wiki

Syntax: /msg NickServ GHOST nickname [password]

Terminates a "ghost" IRC session using your nick. A "ghost" session is one which is not actually connected, but which the IRC server believes is still online for one reason or another. Typically, this happens if your computer crashes or your Internet or modem connection goes down while you're on IRC. In order to use the GHOST command for a nick, your current address as shown in /WHOIS must be on that nick's access list, you must be identified and in the group of that nick, or you must supply the correct password for the nickname.

Back to NickServ commands.