/*
Module : EnumSer.CPP
Purpose: Implementation for a class to enumerate the serial ports installed on a PC using a number
         of different approaches. 
Created: PJN / 03-10-1998
History: PJN / 23-02-1999 Code now uses QueryDosDevice if running on NT to determine 
                          which serial ports are available. This avoids having to open 
                          the ports at all. It should operate a lot faster in addition.
         PJN / 12-12-1999 Fixed a problem in the Win9x code path when trying to detect 
                          deactivated IRDA-ports. When trying to open those, you will 
                          get the error-code ERROR_GEN_FAILURE.