Swf to swf in different html Local Connection?

hello, I have 1 html page with 1 swf. And a second html with a second swf.
When you push button 1 in the first swf it opens a new window (with second html) and opens the second swf.
I now need to know how i get the second button to open another frame in the second swf.
Hope you know what i mean.

All the help on internet that i found wher about 2 swf on 1 html page.
Can someone help me please

(ps. an other selution could be to load the second swf in de first but the second swf is bigger than de first. I don’t know if that even possible)