Is it possible to assign pages to two (or even more) different portals (parent or child) at the same time?

The background for this:
Two related portals, let's call them A and B, "http://www.a.com/" and "http://www.b.com/", have some common pages. If I make independent page copies for each site, I have to maintain them twice, which is double work and will probably cause inconsistencies sooner or later.

Sure, I could create all the common pages in portal A, and make the corresponding pages in B links to the pages in A, but this would irritate the visitors of B, because the navigation of B is then replaced by the one of A, and, after all, I want to keep the visitors in B, and they should think that they're looking at B's own content!

Sounds quite tricky to me (but I'm a DNN newbie...). So, if someone of you has done something similar, I  would be thankful for any hint!

PixelNinja is correct - however, I would like to also let you know that it does not work with every module.

For example - Any module that extends use in the *module settings* area, will not work, becuase you can't see the settings only the shadow settings.

I ran into problems with a few modules which, use the settings, and by default lay the module out differently- eg.. information displayed horizontally or vertically, or paging, which uses the settings area to do this, made this module not suitable to use.

But for standard html inclusion, it's very good.

Nina Meiers