Syntax: %bSET <nickname> URL <url|->%b

Sets the your url to <url>. When users perform an %bINFO%b
on your nickname, they will be informed of your url,
unless you set %bHIDE%b ON. To clear your url use a "-" as
the parameter.
Note that settings should be usually applied to
%bmaster%b nickname.

Examples:
         %b/msg %N SET nick URL http://my.site.com%b
           Sets your url to "http://my.site.com".

         %b/msg %N SET nick URL -%b
           Clears your url.
