Creates a subprocess of the current process. Portions of the
    current process context are copied to the subprocess.

    The RESOURCE_WAIT state is required to spawn a process.
    Requires TMPMBX (temporary mailbox) or PRMMBX (permanent
    mailbox) privilege. The SPAWN command does not manage terminal
    characteristics. The SPAWN and ATTACH commands cannot be used if
    your terminal has an associated mailbox.

    Format

      SPAWN  [command-string]