What is the difference between the NTconfig.pol, NTuser.dat and NTuser.man files when setting up policies and profiles?
NTconfig.pol is the system policy found on Windows NT systems. If it is found on Windows 2000 systems, it will be applied first before any group policy objects (GPOs). But most of its settings will be ignored due to the differences between NT and 2000.
NTuser.dat is the portion of the user profile where the registry settings for that user are stored. When it is named .dat, the user is able to make changes to the desktop environment (i.e., the user profile) and those changes will be saved when the user logs out.
NTuser.man is the same thing as NTuser.dat, but it has been manually renamed to .man in order to change the profile from user-configurable to a mandatory profile. Profiles with NTuser.man can be employed by multiple users simultaneously, since no user changes will be saved into the profile when they log off.
You, as an administrator, can change the name of NTuser.man to NTuser.dat and vice versa as needed.