Windows Environment History of Windows: Windows was announced by microsoft in november 1983 and was released in november Advantage: Windows 1.0 contains updates to support drivers for video display and printers Windows 2.0 was released on november Advantage: 1. Windows 2.0 introduce the concept of overlapping of window rather than tiled in window It has enhancement to keyboard and mouse interface.

Example of Overlapping window

 Windows 3.0 was released on may Advantages: 1. It support 16 bit operation of intel 286,386,486 microprocessor. 2. This version of window gain a foothold in home and office. Conflicts: 1. In september 1990 conflicts b/w IBM and Microsoft occurs. 2. IBM took over os/2 and microsoft the windows.  Windows 3.1 was released in April Advantages: 1. It supports multimedia, Object linking and Embedding.  Windows NT released on july Advantages: 1. It support 32 bit mode and pentium processors. 2. It contain 32 bit address space and 32 bit instruction set.

 Windows 95 was introduced in august Advantage: 1. It requires fewer hardware resources. Disadvantages of Window NT : 1. Lack of security and portability.  Windows 98 was released on june Advantages: 1. Better hardware support. 2. Closer integration with internet and world wide web. Aspects of windows:  Windows 98 and NT are 32 bit preemptive multitasking.  Windows uses graphical user interface.It is also called as “graphical windowing environment” or “visual interface”.  GUI make use of video display.  Video display will be in the form of icons and from input devices such as mouse,keyboard etc. (eg: pressing the button icon).

 To facilitate the use of multiple program and exchange of information windows support multitasking. MULTITASKING:  Several programs can be displayed and running at the same time.  The user can move the window around the screen,change their sizes.  Transfer data from one program to another,switch switch b/w different programs.  Windows sometimes use a “DESKTOP METAPHOR” for the display of multiple programs.  Operating system cannot implement multitasking without memory management.  System must consolidate free memory space.

 Program running in window can share routines that are located in other file called “Dynamic link library”(dll).  Programs in window cannot directly access hardware such as screen or printer.  Windows include graphics programming language called Graphical device interface(GDI).  GDI allow easy display of graphics and text.

 Dynamic link library: Windows will have files with extension.dll or.exe.They are located in \WINDOWS\SYSTEM.  Windows contain a number of function call that application can use such as “CreateWindow”.  All window function are in header files.And we should “import libraries”that dynamic link library name.

1. info/210/Lab1_VcIntro/Index.html info/210/Lab1_VcIntro/Index.html 2. /5776 chap01.pdf. /5776 chap01.pdf 3. c/Basic-concepts. c/Basic-concepts 4. in/visuals/default.aspx. in/visuals/default.aspx