Digital BW, The Print

Pretty basic QTR question here so hoping someone can help. If I install
Harrington's QTR will it affect the ability to print via the normal Epson
driver? My concern is that I need to be able to print from a well
established workflow to a 2200, 7500 and 1270 in color so I don't want the
presence of the QTR to interfere. For instance, regarding the gimp driver
that's required, does it "override" the existing system? Just don't want to
screw anything up!

Thanks for your help!

Rick