Digital BW, The Print

Thanks to visionaries at our little company, we are getting a new, 
faster-than-God G4. I am a PC person with not much mac experience. 
Is it true that the Piezo driver ties up Photoshop for the duration 
of its export? Will this be the case with DP aware Pshop 7 running 
under osX? Or, should I keep my XP box as a print server...?
Thanks,
Dennis Craven