[TYPO3] Overwriting $TSFE->pSetup with USER vs. USER_INT

[robin niemeyer]

Hi all,

inside a frameset we have two flash navigations that need to communicate 
with each other. To do this, they need some sort of id (both the same), 
which should be generated once per frameset instantiation.

We came up with the following solution (see code below): First, we 
generate a unique id, afterwards we initialize each frame with it by 
setting the frame's 'option' parameter, finally we pass the id around by 
setting config.linkVars to include our id. That's the theory. In 
practice however, some (!) of us experience some problems which are 
obviously cache or proxy related, i.e. they are getting the same id twice.

The problem is that for me everything works just fine, but I'm really 
unsure about the way I have implemented things, so I would like to ask 
you for help.

I thought the best way to solve the problem was through a USER_INT 
object, but that doesn't work for reasons I don't know (but like to), so 
we use a USER object instead and call $GLOBALS['TSFE']->set_no_cache() 
from inside our function.

The TypoScript:

myframeset.4 = USER
myframeset.4{
     userFunc = user_NavUtils->setFlashNavId
}

myframeset.frameset{
    ...
}

The function:

function setFlashNavId($content, $config)
{
     global $TSFE;

     $flashid = mt_rand();
     $GLOBALS['TSFE']->set_no_cache();

     $TSFE->pSetup['frameSet.']['10.']['options'] =
     "flashid={$flashid}";

     $TSFE->pSetup['frameSet.']['20.']['24.']['options']  =
     "flashid={$flashid}";

     $TSFE->pSetup['frameSet.']['20.']['26.']['options'] .=
     "&flashid={$flashid}";
}

So, my question is: Does this code in all its simplicity look like it 
could make any sense? And secondly: I still would like to user a 
USER_INT object rather then calling set_no_cache(), but though I 
actually can access $TSFE->pSetup, I could not set/overwrite its 
settings - what do I need to do to achieve this?

I would appreciate your help very much, since I really have no clue.

Greetings
Robin