This text is quoted from The Microsoft KnowledgeBase:


The article contains REGISTRY entries for Subsystems, Part 2. These
subgroups are included:
 - AeDebug Entries
 - Compatibility Entries
 - Devices Entries
 - Embedding Entries
 - File Manager Entries
 - related.desc Entries
 - Userinstallable.drivers Entries
 - WinlogonEntries
 - drivers.desc Entries
 - drivers.desc Entries
--------------------------------------------------------------
This is the second of two articles on these entries; for the other entries,
see "Registry Entries for Subsystems, Part 1".
REGISTRY ENTRIES FOR SUBSYSTEMS
===============================
This section describes software registration entries related to Windows NT
subsystems.
AEDEBUG ENTRIES
===============
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AeDebug
Debugger   REG_SZ
<<DEFINE
COMPATIBILITY ENTRIES
=====================
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft
   \Windows NT\CurrentVersion\Compatibility
Application Name   REG_SZ
These are the defaults:
   _BNOTES=0x24000
   AMIPRO=0x0010
   APORIA=0x0100
   CCMAIL=0x0008
   CHARISMA=0x2000
   CP=0x0040
   DESIGNER=0x2000
   DRAW=0x2000
   DRAW=0x2000
   ED=0x00010000
   EXCEL=0x1000
   GUIDE=0x1000
   JW=0x42080
   MCOURIER=0x0800
   MILESV3=0x1000
   NETSET2=0x0100
   NOTSHELL=0x0001
   PACKRAT=0x0800
   PIXIE=0x0400
   PLANNER=0x2000
   PLUS=0x1000
   PM4=0x2000
   PR2=0x2000
   REM=0x8022
   TBOOK=0x0400
   TME=0x0100
   TURBOTAX=0x00080000
   VB=0x0200
   VISION=0x0040
   W4GL=0x4000
   W4GLR=0x4000
   WIN2WRS=0x1210
   WINSIM=0x2000
   WPWINFIL=0x0006
DEVICES ENTRIES
===============
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Devices
printerName   REG_SZ   spooler,port
-----------------------------------
Defines the spooler and port for a local printer.
DRIVERS.DESC ENTRIES
====================
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft
   \Windows NT\CurrentVersion\drivers.desc
DRIVERS32 ENTRIES
=================
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft
   \Windows NT\CurrentVersion\Drivers32
Defines the Windows NT dynamic-link library for applications
application   REG_SZ   DLL filename
-----------------------------------
   aux=mmdrv.dll   midimapper=midimap.dll   wave=mmdrv.dll
EMBEDDING ENTRIES
=================
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
   Windows NT\CurrentVersion\Embedding
Application Name   REG_SZ   OLE identification
----------------------------------------------
   Package=Package,Package,packager.exe,picture
   PBrush=Paintbrush Picture,Paintbrush Picture,pbrush.exe,picture
   SoundRec=Sound,Sound,SoundRec.exe,picture
FILE MANAGER ENTRIES
====================
Under this key are subkeys defining parameters for File Manager. The
default subkey defines add-ons under this path:
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT
   \CurrentVersion\File Manager\AddOns
acledit    REG_SZ
Default:  acledit.dll
RELATED.DESC ENTRIES
====================
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows
NT\CurrentVersion\related.desc
USERINSTALLABLE.DRIVERS ENTRIES
===============================
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft
   \Windows NT\CurrentVersion\Userinstallable.drivers
WINLOGON ENTRIES
================
The Registry value entries that control the logon sequence for starting
Windows NT are found under the following Registry key:
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
AutoAdminLogon   REG_SZ   0 or 1
--------------------------------
Specifies automatic logon if this value is 1. You must also add the value
entry DefaultPassword with a value for the user listed under
DefaultUserName for  automatic logon to work.
When AutoAdminLogon is used, Windows NT automatically logs on the specified
user when the system is started, bypassing the CTRL+ALT+DEL logon dialog
box.
CacheLastUpdate   REG_SZ
------------------------
For internal WinLogon use only.
CachePrimaryDomain   REG_SZ   Domain name
-----------------------------------------
Default:  NEWDOMAIN
CacheValid   REG_SZ
-------------------
Default:  1
For internal WinLogon use only.
DebugServerCommand   REG_SZ   No or Yes
---------------------------------------
Default:  no
For the internal Microsoft debug tool used to debug CSRSS.EXE
DefaultDomainName   REG_SZ   Domain name
----------------------------------------
Default:  NEWDOMAIN
Specifies the name of the last successfully logged on domain.
DefaultPassword   REG_SZ   Password
-----------------------------------
Specifies the password for the user listed under DefaultUserName. Used
during automatic logon.
DefaultUserName   REG_SZ   Username
-----------------------------------
Specifies the name of the last successfully logged on user. If values are
defined for DefaultPassword  and AutoAdminLogon, this is the user who is
logged on by default during automatic logon.
LegalNoticeCaption   REG_SZ   String
------------------------------------
Default:  (none)
Specifies a caption for a message to appear when the user presses
CTRL+ALT+DEL during logon. Add this value entry if you want to add a
warning to be displayed when a user attempts to log on to a Windows NT
system. You must acknowledge this message before proceeding with the logon.
To specify text for the message, you must also specify a value for
LegalNoticeText.
LegalNoticeText   REG_SZ   String
---------------------------------
Default:  (none)
Specifies for a message to appear when the user presses CTRL+ALT+DEL during
logon. Add this value entry if you want to add a warning to be displayed
when a user attempts to log on to a Windows NT system. The user cannot
procede with logging on without acknowledging this message. To include a
caption for the logon notice, you must also specify a value for
LegalNoticeCaption.
ReportBootOk   REG_SZ   0 or 1
------------------------------
Default:  1
When this value is set to 0, it disables the automatic (default) startup
acceptance, which happens after the first successful logon. This value must
be 0 if you use alternate settings in the BootVerification or
BootVerificationProgram keys.
Shell   REG_SZ   Executable names
---------------------------------
Default:  taskman,progman,wowexec
Specifies executables that are run by USERINIT and that are expected to be
in the user s shell program. If for some reason WinLogon cannot start the
entries listed in Userinit, then WinLogon will execute the entries in Shell
directly.
System   REG_SZ   Executable names
----------------------------------
Default:  LSASS.EXE,SPOOLSS.EXE
Specifies executables to be run by WinLogon in the system context. These
are activated during system initialization.
Userinit   REG_SZ   Executable names
------------------------------------
Default:  USERINIT,NDDEAGNT.EXE
Specifies executables to be run by WinLogon when a user logs on. These
executables are run in the user context. The first entry (USERINIT) is
responsible for executing the shell program. NDDEAGNT.EXE is needed to run
NetDDE.
Reference: "The Windows NT Resource Kit for Operating System Version 3.1"

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