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Synopsis:
    #include <dos.h>
    void _dos_keep( unsigned retcode, unsigned memsize );

Description:
    The _dos_keep function is used to install terminate-and-stay-resident
    programs ("TSR's") in memory.  The amount of memory kept for the program
    is memsize paragraphs (a paragraph is 16 bytes) from the Program Segment
    Prefix which is stored in the variable  _psp.  The value of retcode is
    returned to the parent process.

Returns:
    The _dos_keep function does not return.

See Also:
    _chain_intr, _dos_getvect, _dos_setvect

Example:
    #include <dos.h>

    void permanent()
      {
        /* . */
        /* . */
        /* . */
      }

    void transient()
      {
        /* . */
        /* . */
        /* . */
      }

    void main()
      {
        /* initialize our TSR */
        transient();
        /*
            now terminate and keep resident
            the non-transient portion
        */
        _dos_keep( 0, (FP_OFF( transient ) + 15) >> 4 );
      }

Classification:
    DOS

Systems:
    DOS