Admin image basics

I have some basic questions implementing admin images:

1. Can I install an admin image to my personal workstation (64 bit Vista)?

2. Should admin image be online all time (does clients need it during work time)?

3. Do I need an own admin image for each different workstation OS (XP/Vista/7 - 32/64 bit)?

4. Does an admin image need an additional license?

5. Anything else to be aware about using admin image(s)? Any problems?

SolidworksAdministration