I have 5 systems that are connected to a network switch
Desktop(1) : Ubuntu 10.04 LTS
Netbook(1) : Windows 7 Starter
Desktop(1) : Windows 7 Professional
Laptops(2) : Ubuntu 11.04
Now, I need to make a data-backup central, which store all data (from all my systems) on Desktop running Ubuntu 10.04 LTS
What I need is, how to make my Linux system show up on Windows?
I also want to map user-to-directory, so that when I log-in to my desktop using Windows, I should be asked Login Credentials, and on successful login, I should be presented on that directory, that I have permission.
If you wish to share a folder from linux to windows you need to use Samba.
The quickest way of achieving this is to right click on the folder select 'Properties > Share > "Share this Folder"' and Ubuntu should install the relevant files needed.
Use Samba to share the folder in ubuntu, you can set permisions for users with samba, map each drive on the windows boxes
Looking here for help on user and perms. Samba
As for login credentials unless you plan on adding an Active Directory you will have to have them locally set on the machine. You can use a windows login script to automatically open the direcorory on login.