I can't find a way in the doc to loop through hash without knowing the keys in the hash. If this feature is not available, I think the fact that the template has to always such intimiate knowledge of what's being passed to it is not always a good thing, it also makes it impossible to just dump out all the data on the HTML end with a simple statement.
e.g.
<tmpl_loop students>
<tmpl_var name>
</tmpl_loop>
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