Prospective byer's Q's about Contribute

["Dan V" <webforumsuser@xxxxxxxxxxxxxx>]

I'm a developer looking for a suitable solution to let client maintain parts of 
site. Contribute seems to be it, but I would like answers to a few questions:

 1. Can I and client share license?
 2. Client has both PC amd Mac. Can he use same license on both?
 3.  The site already exists and is dynamic (php). Many pages do NOT contain 
traditional html markup, but missing e.g. head, body and html tags (those are 
added by includes). Can I use Contribute anyway?
 4. Can I use Contribute on ANY kind of text file, e.g. css, javascript, plain 
php, etc?
 5. Can I make sure that docs are saved as utf-8 without BOM?

 Any other useful info I haven't even thought of asking?

 TIA
 Dan