Will there be any problems if I have it plugged into 2 computers at the same time? I have my desktop PC (winxp pro) connected to my mfc printer via the old-school LPT port. Meanwhile, the printer also has a USB port. So if I also plug in my mom's laptop (winxp home) into the printer via usb, and start printing, could there be any issues? Or is it entirely safe? Thanks!