Description of Svchost.exe in Windows XP

Each instance of svchost.exe process seen in the Task Manager hosts a group of services. To see the list of services hosted by each instance of svchost.exe, you may use the Tasklist.exe console utility available in Windows XP Professional Edition.
Click Start, Run and type CMD.EXE
Type tasklist /svc >c:\taskList.txt
The taskList.txt will contain the list of Processes, their Process IDs and the Services running under each Process