A Linux server and WindowsXP workstations

[Ant2ne]

How does linux work as a server for domain with WindowsXP workstations?

Does a linux Server keep a Windows compatable Active Directory?

How does NTFS File and Folder encryption work if linux does not use NTFS?

What about File and Folder Permissions and Shared File & Folder Permissions?

Can a linux server share Shared Files & Folders with Permissions?

Can one set NTFS Permissions?

Linky me?