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.Simply right click on the application sexecutable file name in the My Computer window and select theMS-DOS Mode setting in the Advanced screen.It is also possible to adjust the memory allocated to the programthrough the My Computer/Properties/Memory tab.This functionis accessed by right clicking its executable file name, moving tothe Memory window, and increasing or decreasing the memoryavailable.The Memory tab allows the user to establish memory allocationproperties for the application.Values can be selected for Conven-tional, Extended, and Expanded memory usage, as well as forconfiguring HMA and UMB operations.These settings are stilldependent on the information that may exist in the CONFIG.SYSfile.In particular, check the CONFIG.SYS file for noems parame-ters in the EMM386 statement.If present, replace it with an ap-propriate ram or x=mmmm-nnnn parameter.The Screen tab provides several options for how the application willbe presented on the screen.It is possible to set the window sizethat the application will run in.These options include FullScreen, a user-definable window size, and a default window sizebased on the size determined by the graphic mode the applica-tion is using.This tab also allows the Windows 95 toolbar to be displayed on thebottom of the screen.This feature can be valuable if the applica-tion becomes unstable or has trouble running in Windows.Finally, the Screen tab allows the application to use the Windows95 Fast ROM emulation and Dynamic Memory allocation features.These functions are selected to speed up video output operations.Windows 95 StructureWhen fully installed, the Windows 95 structure is as depicted inFigure 4.26.The new Registry, Configuration Manager, and Virtu-al Machine Manager have already been introduced.However, theyhave been joined by an Installable File System (IFS) Manager tofunction between the Win95 core and the device drivers that A+ Certification Training Guide280service the system s hardware.On the other side of the Win95core, applications running on the system are accessed through thenew 32-bit, shell and user-interface tools.Figure 4.26The Windows 95organizationalstructure.The Win95 core consist of three components: the Kernel, theGDI, and the USER files.The Kernel is the foundation of thesystem.It includes basic memory and I/O management, taskscheduling, error (exception) handling, and program executionfunctions.The USER files manage input from hardware devicesand output to the user interface components that is, the iconsand screen structures.The GDI components control what appearson the display.It includes two main subsystems: the Graphics sub-system and the Printing subsystem.These components are dis-cussed in more detail later in this chapter.The RegistryMany of the SYSTEM.INI and WIN.INI management functions ofWindows 3.1 have been relocated to an area known as the Registry.The system s configuration information is held in the Win95 Regis-try.This includes local hardware configuration information, thenetwork environment information, file associations, and user con-figurations.When applications were removed from the system inearlier Windows versions, the configuration information distribut-ed between the various INI files remained, unless the user, or aspecial Windows Uninstall program, looked them up and removedthem individually.With Windows 95, their headings and the associ-ated configuration information are all removed from the Registry,unlike the old INI method of tracking this information. Chapter 4 Microsoft Windows281The contents of the Registry can be viewed and altered through theRegistry Edit utility, shown in Figure 4.27.The Registry files arelocated in the Windows system directory.Each time Windows 95boots up successfully, these files are backed with a.DAO extension.The Registry uses English-language descriptions and a hierarchi-cal organization strategy.The hierarchy is divided into headkeys,keys, subkeys, and values.Keys are descriptive section headers thatappear at the left side of the RegEdit window.Values, on the otherhand, are definitions of topics organized under the keys
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