The variable is listed in bold. The description immediately follows.

$me(nick).  The nickname in your configuration

$me(server).  The server in your configuration

$me(port).  The port in your configuration

$me(userid).  The userid in your configuration

$me(altnick).  The alternate nickname in your configuration

$me(realname).  The realname in your configuration

$me(host).  Your hostname (when connected)

$me(ip).  Your ip (when connected)

$me(sockslist).  A list containing the IDs of your current connections. You can use this to get the number of active connections:

set conns [llength $me(sockslist)]

Or to loop and execute a command for every connection:

foreach id $me(sockslist) {...}

$me(id).  Contains the id of the active connections: when you connect to a new server the connection becomes the active one. When you change window (channel, query, chats) the active connection (and then the value of the me(id) variable) changes to the one relative to the active window.

$me($id,conn).  Where $id contains the ID number of a connection. This variable has a boolean value indicating the state of the connetion relative to ID:

$me($id,registered).  This variable works similar to me($id,conn) but indicates whether you have registered (received the 001 raw) to the server yet:

$me($me(id),nick).  Your nick name for the connection relative to $id.

$me($me(id),server).  The server name of the connection relative to $id.

$me($me(id),net).  The network name of the connetion relative to $id.

$me($me(id),ip).  Your ip address (resolved from your local host).