When a Windows 2000 computer is part of an Active Directory domain there is an icon in My Network Places –> Entire network called Directory. This icon allows you to browse Active Directory. This icon is missing in Windows XP and 2003, but it can be restored!
On a Windows 2000 machine browse to C:\Winnt\System32 and locate dsfolder.dll. Copy this DLL to your XP or 2003 computer and place it in C:\Windows\System32. With the DLL copied over we must register it; from a command prompt run the following:
regsvr32 dsfolder.dll
The Directory icon will now appear in My Network Places –> Entire Network on your Windows XP or 2003 computer.