MCSE : Security Specialist
OS Fundamentals part 1
Windows 9x
IO.SYS The win 95 file IO.SYS,
replaces both of the DOS IO.SYS and MSDOS.SYS files. This file
contains the information needed to start the computer. You no longer
need CONFIG.SYS and AUTOEXEC.BAT to start Windows, but these files
are kept for some drivers and programs that use still them.
The
drivers loaded by default in win 9x IO.SYS include :
HIMEM.SYS
IFSHLP.SYS
SETVER.EXE
DBLSPACE.BIN or DRVSPACE.BIN
Most of
the entries that used to be in your CONFIG.SYS are now included in
the win 9x IO.SYS
IO.SYS
does not load EMM386.EXE. If any application requires expanded
memory , EMM386 must be loaded in CONFIG.SYS. To override default
values in Windows 95 IO.SYS enter the value you want in your
config.sys
WIN.INI This used to contain user and program settings. The
registry replaces the basic functions of the ini files used in
earlier versions of Windows, the System.ini, WIN.INI, and
Winfile.ini. Windows 9x keeps these files for backward compatibility
with 16 bit applications that can not access the windows registry.
User.dat Is one of three files that make up the windows
registry. It is located in c:\windows directory , but if User
Profiles are enabled then users may have there setting stored in
c:\windows\profiles
USER.DAT contains the following settings:
Logon names
Desktop settings
Start menu settings
The
other two files that make up the registry are:
System.dat Contains all the hardware configuration, Plug and
Play settings, and application settings. It is located in
c:\windows as a hidden file.
Policy.pol May override any settings contained in the other
two registry files. And can contain additional data specific to
a network .You do not need Policy.pol to run windows.
SYSEDIT System Configuration Editor , can be found in
c:\windows\system. This program allows you to edit protocol.ini,
System.ini, win.ini, config.sys, and your autoexec.bat files.
SYSTEM.INI In win 3.1 hardware
setting were found here. Most configuration options for Windows 9x
are now stored in the Registry and are no longer required in
SYSTEM.INI. but this file is retained for backwards compatibility.
MSCONFIG (98) This is the System Configuration Utility
located at c:\windows\system\msconfig.exe. This program lets you
troubleshoot system configuration problems, by removing entries with
check boxes, reducing the chance of typing errors which may happen
if you use Notepad or the System Configuration Editor. It also
allows you to create a backup of your system files before you change
anything. It allows you to remove programs that are automatically
started when windows starts.
COMMAND.COM DOS file that contains the DOS command processor,
receives and executes operating system commands
REGEDIT.EXE
Registry Editor is a tool for displaying and editing the registry
database. It is located in c:\Windows directory . If you are running
win 2000 you should use regedit32 instead.
SYSTEM.DAT Contains all the
hardware configuration, Plug and Play settings, and application
settings. It is located in c:\windows as a hidden file.
RUN COMMAND where you enter a command in the windows run box
interpreted by windows not DOS
COMMAND LINE PROMPT
where you enter a command in DOS
which is interpreted and executed by command.com i.e.: c:\copy
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