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You're kinda right, but then again you're not..
Using the NOARCHIVE tag will eliminate the cached snapshot, but the page will still be indexed.
Nomally I'd suggest the ROBOTS, NOINDEX,NOFOLLOW tag, but that isn't even a great solution to this problem as you specifically want to know how to prevent bots from crawling pages, not just refraining them from being indexed..
The only answer is to use the robots.txt file and ban each file separatly (or the single directory inside of which all files not be crawled reside?).