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EscapeCommFunction   Send IOCTL Command to Comm Device Driver

short EscapeCommFunction(nCid, nFunc)
int nCid; /* Value returned by OpenComm */
int nFunc; /* See below */

                nFunc
        |-----------------------------------|
        | SETXOFF  Simulate XOFF receive    |
        | SETXON   Simulate XON received    |
        | SETRTS   Set RTS high             |
        | CLRRTS   Set RTS low              |
        | SETDTR   Set DTR high             |
        | CLRDTR   Set DTR low              |
        | RESETDEV Reset device if possible |
        +-----------------------------------+

Returns:    Negative if nFunc was not valid, zero if successful.