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 I - internal information

 I       Same as I0.
 I0      Request product code.  For Hayes 2400, returns "24x" where "x"
         is the revision level of the modem.
 I1      Request three-digit checksum of modem ROM.
 I2      Validate ROM checksum.  Returns "OK" or "ERROR" (in text result
         mode).

 Example:

     SendModem(nPort, "ATI2" + chr(13))