Hi Mat,
 

> ...and I get the impression this trick enables som kind of push, no?
>
 
If your reference provides the kind of talking between framed contents then 
I would argue that there could be some kind of manual communication 
pattern, e.g.:

   1. let there be WikiA from UserA and WikiB from UserB
   2. let there be TiddlerA in WikiA and TiddlerB in WikiB iframing 
   TiddlerA from WikiA
   3. let UserB create ReplyB in WikiB as a response to TiddlerA from WikiA
      - some cross-frame magic could help UserB to assign a *origin:WikiA*
       and a *reply:TiddlerA* field to ReplyB
      4. let UserA iframe WikiB, e.g. in TiddlerA, and do some 
   crose-frame-magic to see if WikiB has any tiddlers where
      - *origin:WikiA* and *reply:TiddlerA* are set for any tiddlers, and 
      perhaps check for their dates
      5. let UserA, in turn, create ReplyA as a response to ReplyB from 
   UserB, perhaps also tagging ReplyA with *TiddlerA*
      - the cross-frame-magic would also help UserA to assign a 
      *origin:WikiB* and a *reply:ReplyB* field to ReplyA
   6. let UserB visit his response ReplyB iframing WikiA so as to check if 
   any response exists
   7. etc...
   
So, yes, it sounds like there might be ways to do *manual* communication, 
granted this cross-frame-communication pattern allows for UserB to access 
WikiA in a well defined manner, if only through a url pattern.

Something tells me that this mutual iframing may yield WikiA iframing WikiB 
which in turn iframes WikiA, endlessly. So, not sure what would happen 
there.

Best wishes, Tobias.

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