SUBSCRIBE{ attributes } - subscribe the current user for notification of changes to the current topic 
Anywhere in a topic or template: 
-  %SUBSCRIBE{...}%or simply%SUBSCRIBE%     						| Parameter | Default | Meaning |  			| who | Logged-in user | Who to subscribe (wikiname, no web) |  			| topic | Current topic | Topic to subscribe to. Wildcards may be used e.g. topic="Item*"will subscribe to all topics starting withItem. Usetopic="Main.*"to subscribe to the WebNotify for the Main web. |  			| unsubscribe | Not set | If set to "on", will unsubscribe the user |  
 
The format of the Subscribe/Unsubscribe button is defined in a template file 
templates/subscribe.tmpl. The normal skin mechanisms can be used to override this with your own local definitions. The default template works with Javascript to provide a smooth interactive experience.

 The 
format  and 
formatunsubscribe parameters have been removed and will
be ignored. The version of PatternSkin shipped with Foswiki 1.1.9 used these
parameters.