Function for using skills?

Is it possible to force a unit to use a spell? (Outside of the ones provided by the editor).

erm..yeah..

for instance, that spell will make the character "Hero" use wind walk at initialization

I know those, is it possible to do that for spells outside of the pre-given skills.

What is your custom spell based on?
Have your caster cast the spell your custom spell is based upon.

So if I made a spell based on Blizzard...
Order them to cast the spell "Human Archmage - Blizzard"

yes, just use the order of the spell you based it on,
say you based it off of Blizzard..
then use

EDIT:WOW he said like the exact same thing at the exact same time...WTF