Prevents users from starting applications other than MS-DOS-based applications from the Command.com prompt.
When you exit an MS-DOS-based application, Windows XP returns to the command interpreter, Cmd.exe. When you run a terminate-and-stay-resident program (TSR) or temporarily suspend an MS-DOS-based application to return to the command prompt, Windows XP runs the command interpreter for the MS-DOS environment, Command.com. This preserves the MS-DOS environment, allowing you to use the TSR immediately.
Because starting and running other types of applications from the Command.com prompt can disrupt a TSR or suspended MS-DOS-based application, Windows XP provides dosonly. With dosonly, you can start only MS-DOS-based applications from the Command.com prompt. You can include dosonly in your Config.nt file or the equivalent custom startup file in an application's program information file (PIF).
Config.nt is used to initialize the MS-DOS environment, unless you specify a different startup file in an application's PIF.
Include dosonly in your Config.nt file, or the Config startup file specified in the PIF. The following example shows how a Config.nt might look.
dos=high,umb device=%systemroot%\system32\himem.sys files=40 @echo off dosonly