Here are th names of the useful MMC Console tools (.msc) that come with Windows XP. You can run them directly by typing their name in the Start / Run… or by pressing the Start button + R (german keyboards U):

compmgmt.msc – Computer management
devmgmt.msc – Device manager
diskmgmt.msc – Disk management
dfrg.msc – Disk defrag
eventvwr.msc – Event viewer
fsmgmt.msc – Shared folders
gpedit.msc – Group policies
lusrmgr.msc – Local users and groups
perfmon.msc – Performance monitor
rsop.msc – Resultant set of policies
secpol.msc – Local security settings
services.msc – Services