Question: External calling for dummies

I already asked this, but I still am not sure how to perform it, so here I'm again :-). I already read http://www.maplesoft.com/support/help/view.aspx?path=Define_external

Say I've got that mat_mult-Funktion like in the example in that link written down in a file called "code.c".

What now? Do I have to compile it? (Do I really need a .dll?)

Thx in advance for your patience!

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