AppleScript tip: legal variables names

Variable names in AppleScript are pretty flexible, especially when compared to other languages. Variable names can consist of letters, numbers, and underscores, with the only limits being (1) the first character in the name can't be a number, and (2) the name itself must be less than about 250 characters (I don't know the exact limit, but you really don't want variable names anywhere near that length limit).