I tell you how i did it. First should I tell you that I’m having a Mac, and I don’t know if that has anything to do with it. Anyway.
In pages I created a Contact page, and in it appears in the sidebar. I can click Contact and it opens up in the frame in the middle.
In the Contact page I have links to two diffent pages, the first one is an contact form, and the second one is the guestbook. And I type in the whole adress with https://and everything, and it opens in a new window. It doesn’t matter what link I put in.
To answer you question, when I created that page the WordPress makes an link with an ?id=1 and it links itself into the right frame, so I didn’t do anything there, more than created that page.
?? What could I do wrong?