win2000 device driver stack

I’am building a bus enumerator upon SERIAL driver, but following question
can be extend to any kind of bus enumerator.
Bus enumerator should be attached to SERIAL (it is specified in .INI file),
but SERIAL has SERENUM bus driver already attached to it.
Does iomanager create two different device stacks, one containing SERENUM on
SERIAL (PDO) and one containing MYENUMERATOR on another SERIAL (PDO)? Or
does iomanager stack MYENUMERATOR on SERENUM on SERIAL (PDO) as the first
two are also filter drivers?
An answer will clarify my understanding on win device driver philosophy.
Michele


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