======Synopsis:======
[[on]] [#][<mode>]who [<serial#>] [-|^]<match> { <action> }

======Description:======
This hook is triggered when the client receives server output from the
[[WHO]] command.  Each line received can trigger the hook.

======Parameters:======
|$0 |channel the user is on, of '*' if none or if it is private|
|$1 |nickname of user|
|$2 |status of user: %%<G|H>[*][@|+]%%|
|   | 'G' for gone (away), 'H' for here (not away), '*' for irc operator, '@' for channel operator, '+' for voice status |
|$3 |username portion of user's address|
|$4 |hostname portion of user's address|
|$5 |user's server|
|$6 |server hopcount from user|
|$7- |user's IRCNAME|