I have installed GV250 and GV600 on 2 computers with Windows XP, I need to see the gv600 cameras with one MAC OS 10.5 computer, How can I do this?? the error send is CAMERA NOT AVAILABLE.

The only way you can view your system is via JEPEG image viewer.
Geovision uses Activex for its full applications, which is from Windows.
If you had Mac OSX system you could install virtual Windows within that system and use all the Geovision services