Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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SYSTEM closes all open files and returns control to the operating system.
 
SYSTEM [n%]
    ■ The value n% can be used by DOS or OS/2 batch files or by
      non-BASIC programs. Untrapped errors and fatal errors set the value
      of n% to -1.
 
Usage Notes
    ■ In a stand-alone program, SYSTEM returns to the operating system and
      closes all files; in the QBX environment, SYSTEM stops program
      execution and closes all files.
 
Important
    ■ A program containing a SYSTEM statement exits to the operating
      system if run from the QBX command line with the /RUN option.
    ■ Entering a SYSTEM statement in the Immediate window terminates
      BASIC.
 
Differences from BASICA
     ■ END and SYSTEM are distinct in BASICA but act identically in the
       current version of BASIC.