• Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint
Share this Page URL
Help

Chapter 11. Working with Applications > Understanding How DOS and Win16 Applica...

Understanding How DOS and Win16 Applications Work with Windows NT

The first set of applications examined in this chapter is DOS and Win16 applications. In this section, you learn how Windows NT Workstation supports DOS and Windows 3.x applications. You also learn about the architecture of the subsystem that supports running DOS and Win16 applications, as well as how Windows NT Workstation creates the proper environment for those applications. With this understanding, you are better prepared to troubleshoot problems with these types of applications.

A Quick Word About the Architecture

When a DOS or Win16 application starts in Windows NT Workstation, the application thinks it is running in the DOS operating system. Actually, the application is running in what Windows NT calls an NT virtual DOS machine (NTVDM). An NTVDM is a virtual process that simulates the DOS environment for any DOS or Win16 application running in it. Any servicesrequested by the applications are brokered by the NTVDM to virtual device drivers and other service providers, which pass requests on to the real Windows NT drivers or other systems in Windows NT.


PREVIEW

                                                                          

Not a subscriber?

Start A Free Trial


  
  • Creative Edge
  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint