Windows

To most users, a window is a rectangular area of the display screen where an application receives input from the user and displays output. This chapter describes the parts of the operating system that enable a Presentation Manager (PM) application to create and use windows; manage relationships between windows; and size, move, and display windows. An overview of the following topics is presented:

• Window types, classes, and styles
  
• Window-creation techniques
  
• Window messages and message queues
  
• Methods of window input and output
  
• Window resources and procedures
  
• Window identification and modification

Subsequent chapters present more in-depth descriptions of windows, their advantages and uses, along with example code fragments.