Yes it is possible. If the program you're using supports more than one universe of DMX output then you can use more than one. Olaf's dmxusbpro object for Max supports using more than one. http://www.nullmedium.de/dev/dmxusbpro/

wow, it' great! yes, i'm using the nullmedium patch. I've opened more ports to set different universes. Is it correct??? Cheers

and..the last thing :) if i connect more than one enttec how is it possible that the computer recognize what's the correct dmx. you know that ports can change sometimes..

Use more than one of the object.

so this means it is possible to use one pro as an input and one for the output?