Windows XP Tips: Control User Logins by Hacking the Registry

To  control  logon  options,  run  the  Registry  Editor  [Hack  #83]  and  go  to  the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows  NT\CurrentVersion Winlogon subkey, which contains a variety of logon settings (as well as some settings not having to do directly with logons). Following are the most important values you can edit to customize logons. 

DontDisplayLastUserName This setting lets you control how the system logon dialog box is used. If this String value is present and set to 1, all users will have to enter both their username and password to log on. If the value is 0, the name of the last user to log on will be displayed in the system logon dialog box. 

DefaultUserName This  String  value  contains  the  name  of  the  last  user  who  logged  on.  It  will  be 

displayed only if the DontDisplayLastUserName value is not present or is set to 0. 

LegalNoticeCaption and LegalNoticeText// Already discussed PasswordExpiryWarning  This DWORD value lets you display a warning message to users a certain number of days before their passwords are set to expire. It lets you determine how many days ahead of time the warning  should  be issued.  To  edit the  value, click the decimal button and enter the number of days. 

ShutdownWithoutLogon This String value enables or disables a button on the XP logon dialog box that lets the system shut down. A value of 1 enables the button (so that it is shown); a value of 0 

disables the button (so that it is not shown). 

Shell It  determines  the  shellthe  user  interfacethat  will be  used  by  XP.The  default  is Explorer.exe, but it can be another shell as wellfor example, the Program Manager from  older  Windows  versions.  Type  in  the  name  of  the  program;  for  example, Progman.exe for the Program Manager, or Taskman.exe for the Task Manager. 

AutoRestartShell This DWORD value doesn't have to do with logons either, but it's another good one to 

know. It sets whether to automatically restart the Windows shell if the shell crashes. A value of 1 automatically restarts the shell. A value of 0 tells XP not to restart the shell, forcing you to log off and then back on again to restart it.

"Windows XP Tips: Control User Logins by Hacking the Registry"

Reference : techpraveen.com