Norton Internet Security...and Pro

Hello folks,

Could anybody please tell me the difference between the standard and pro versions? I always thought it was just that the pro version allowed installation on multiple machines (I need to stick it on 3, but currently have a single machine with the standard version which expires in 2 weeks). However, the website doesn't state that pro can be used on multiple machines - anybody know?

If you can use the pro on multiple machines then I'll get that. If not then I guess I'll just have to renew the current standard version and buy two additional standard ones.

Also, if the US versions are cheaper than the UK can you just buy the downloads from the US store?

Thank 'ee kindly for your help folks ;)