I first described the Runas utility in tip 2548.
When you use Runas from a command prompt, without the /profile switch, the default user profile is used instead of the impersonated user profile.
NOTE: If the program or batch you run creates a file in the My Documents folder, it will be created in the default user My Documents folder.
NOTE: If you use Start / Programs / Accessories / SHIFT+right-click / Command Prompt, the /profile switch is used by default.
NOTE: Windows XP always loads the profile of the impersonated user.