Yes, you can install FileMaker Pro on both machines. The only problem is if you are on a network and you try to launch both applications at the same time. One would be denied because it would see the license key being used on the other computer.
Thanks for the prompt reply. It got me thinking...why not try installing FM Pro 7 on the Mac laptop, both OS X 10.5 and Vista via BootCamp. FM Pro 7 was an upgrade box (I think from a Mac 4.0 or 4.1 product); both platforms look for the already installed FM Pro 6 (which it won't find); inputting the 35 digit Ver. 6 alpha/numeric key supplied by FileMaker doesn't work.
I realize I'm in the "way-back" mode here; just thought I'd give it a try.
I've been running windows exclusively for about half a year on my macbook. It's very safe, I haven't had any problems.Everything works fine