Should I use Passport Authentication only for availing Microsoft Services ?

Question

Hi,

I am new to asp.net. If I use Passport authentication in my website, can I use passport service to my 4 websites which are launched in different servers for providing facility that is One time log on, shared between my 4 websites only. But my websites are not depending on Microsoft services hotmail, windows live etc., Can I use Passport Authentication into my websites?

Thanks in Advance.