Password on Microsoft Workgroup

I'm not sure if this is the right place to ask this question, but as I
couldn't find a better place, I hope somebody here can help me with my
problem.

I am setting up a Microsoft Windows Network and, on some of the networked
machines, there will be shared resources. I named the network MSHOME. The
network works properly and I see all the machines under My Network
Places\Microsoft Windows Network\MSHOME. But, as I try to connect to some
machines, it requires a password, but other machines don't. My question is,
now do I setup/change these passwords? How can I change the passwords on the
computers that already have one and how do I setup passwords to computers
that don't have one.

I am using Windows XP Pro in some computers, and XP Home Edition in others.

Thanks,

Seamus

All NT (XP) machines in a workgroup should have the same set of users
accounts, i.e. the usernames/passwords.