Update vars sent to Flash WITHOUT 'GET' or loadvars?

OK - could somebody simply tell me if this is even possible -

My main.swf is embedded in my index.html page.

It loads external swfs in ONLY WHEN a HTML button, sitting outside my main.swf but ON index.html is clicked - posting it’s variable/value to my swf?

So what I am saying is - Flash will not be functioned to do it’s loadVars magic, I want Flash to be ready & waiting for a new variable to arrive at any given time - THEN action a function depending on the value of the variable.

Does this make sense to anyone? :wink:

I’m just not sure on the limitations of Flash - the program where I thought absolutely ANYTHING is possible.

If it’s not possible then I will go around this problem another way.