about serial.sys and modem.sys

Hello all,
I am trying to develop a serial Port Driver which will be installed as a
port driver of a dummy port. Internally, it will direct all the IRPs it
receives to serial.sys which is the Microsoft Serial port driver for actual
COM Ports. My driver maintains the V42 protocol too. Hence it needs to see
that serial.sys and modem.sys are just conduits of data which do not modify
the data passing through them at all. How can I assure myself that the data
passing through the serial.sys and modem.sys is not modified by them at all
? I would appreciate any help on this subject.
Regards,
Shail.


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