The Free On-line Dictionary of Computing (30 December 2018):

Windows XP Professional Edition
Windows XP Pro
XP Pro

    ("Windows XP Pro", "XP Pro") The version of
   Microsoft's Windows XP operating system intended for
   businesses and advanced users.  The alternative, Windows XP
   Home Edition, is a subset of Pro without Remote Desktop,
   Multi-processor support, Automated System Recovery,
   Dynamic Disk Support, Fax, Internet Information
   Services, Encrypting File System, File-level access
   control, Active Directory, Group Policy, IntelliMirror,
   Roaming profiles and other features.

   Pro-Home Comparison
   (http://www.winsupersite.com/showcase/windowsxp_home_pro.asp).

   (2009-08-12)