2. Windows Environment History of Windows: Windows was announced by microsoft in november 1983 and was released in november 1985. Advantage: Windows 1.0 contains updates to support drivers for video display and printers Windows 2.0 was released on november 1987. Advantage: 1. Windows 2.0 introduce the concept of overlapping of window rather than tiled in window 1.0. 2. It has enhancement to keyboard and mouse interface.

4. Example of Overlapping window

5.  Windows 3.0 was released on may 22 1990. 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 1992. Advantages: 1. It supports multimedia, Object linking and Embedding.  Windows NT released on july 1993. Advantages: 1. It support 32 bit mode and pentium processors. 2. It contain 32 bit address space and 32 bit instruction set.

6.  Windows 95 was introduced in august 1995. Advantage: 1. It requires fewer hardware resources. Disadvantages of Window NT : 1. Lack of security and portability.  Windows 98 was released on june 1998. 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).

7.  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.

8.  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.

9.  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.

10. 1. WWW.CS.Uregina.ca/Links/class- info/210/Lab1_VcIntro/Index.html WWW.CS.Uregina.ca/Links/class- info/210/Lab1_VcIntro/Index.html 2. http://worldscibooks.com/etextbook/5776 /5776 chap01.pdf. http://worldscibooks.com/etextbook/5776 /5776 chap01.pdf 3. www.tutorials.expert.com/tutorials/visual- c/Basic-concepts. www.tutorials.expert.com/tutorials/visual- c/Basic-concepts 4. http://msdn.microsoft.com/hi- in/visuals/default.aspx. http://msdn.microsoft.com/hi- in/visuals/default.aspx