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Well, there isn't really a standard to define what's a unique, but the most common definition is a visitor with unique IP adress within 24h. So, the same IP again in given time range is a raw only. Proxies are treated the same way, so even 10 different visitors from the same proxy would count as 1 unique and 10 raws.
Most programs don't publish how they exactly count uniques, so there is a broad variety of different timeframes (some do 12h, some 48h, most in between), different ways to treat proxies. Some programs only count second page uniques, some join page uniques, it has become quite silly lately and it's impossible to really compare stats for different programs...
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