System Programs

• they basically provides an convenient enviroment for programs for thier development and execution.
• Some of them are simply user interfaces to system call.
• Others are considerably more complex.

Status Information

• Date, time
• Amount of available memory or disk space
• Number of users
• Detailed Performance
• Logging , Debugging Information etc

File Modification

• text editors

Programming Language Support

• Compilers
• Assemblers
• Debuggers
• Interpreters

Program loading and execution

Communication

• Creating virtual connection among the processes , user and computer systems.
• Allowing the user to send messages to another's screen.
• to browse webpage
• to send emails