Does my existing RPI-capable windows communications software still work with WinRPI?
Yes it should, but you need to disable the built-in ECC routines (WinDAPI). For example, in Procomm Plus 2.0 you can select either COM2 or RCOM2 (COM2 is an example COM port). After WinRPI is installed, select COM2 for WinRPI ECC instead of RCOM2 (which uses the older WinDAPI method). See next section.