JSI Tip 0342 - User Manager and User Manager for Domains registry entries for users.

Besides tip 337, User Manager and User Manager for Domains registry entries are at:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows NT\CurrentVersion
\Network\User Manager and

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows NT\CurrentVersion
\Network\User Manager for Domains

One additional Value of type REG_SZ has a default of 500.

ListBoxSplit defines the vertical space for the Username list box. The Group list box is calculated as 1000 - ListBoxSplit. This is the percentage of space where 500 is 50.0%. If ListBoxSplit is 667, then the top 2/3 (66.7%) of the windows is occupied by the Username list box and the remaining 1/3 (33.3%) displays the Groups list box.