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Configuring OS/2 Applications
As with all Windows NT configurations, the configuration data is stored within the Windows NT Registry. This configuration data is stored in the following two locations:
- Hkey_Local_Machine\System\CurrentControlSet\Control\Session Manager\Subsystems
- Hkey_local_machine\Software\Microsoft\OS/2 Subsystem for NT
OS/2 itself stores all its configuration information in the files Config.sys and Startup.cmd. When the OS/2 subsystem is started (when an OS/2 application is executed), Windows NT interprets the Config.sys and Startup.cmd files and adds the necessary configuration information to its Registry.
The suggested method to configure the OS/2 subsystem is to edit the Config.sys file with an OS/2 text editor. It is imperative that an OS/2 text editor is used because it places a header into the file that indicates that it is an OS/2 configuration file.
![[tip.gif]](tip.gif)
A common scenario question on the exam tests your knowledge of configuring the OS/2 subsystem. Typical questions test you on the fact that the Config.sys file must be edited with an OS/2 text editor.