In Windows 2000, getting to the Sharing options for a folder was simple:
Just right-click, choose Properties, and you'd see a Sharing tab.
In Windows XP, this feature is missing by default, but you can make the system display the Sharing tab if desired.
Simply open up Folder Options (My Computer/Tools/Folder Options) and navigate to the View tab.
In the Advanced Settings section, scroll down to the bottom and uncheck Use simple file sharing (Recommended), a Mickey Mouse feature if there ever was one. Now share your folders on the LAN as you would in Windows 2000.