Not really sure what you mean so I'll just give a fully detailed response.
Windows 7 licenscing states that one key can be used on only one computer at a time. If you get a new computer, you can format the drive on the old one, then install 7 on the other computer (provided it is a retail, not OEM, copy) without a problem. You can also reinstall 7 on the same computer without issue.
Office 2010 keys can be used on one desktop and one laptop at a time. I'm not sure if MS actually has a way to tell what type of computer it is on, so it may not matter. Point is one key=two computers, unless it is the home and student edition. Then one key = three computers. These keys can also be reused when moving the install to a different computer or reinstalling the software.