[Help] How do strings work in JASS?

I understand that strings leak. I know that when you GameDisplayTextMessage, the string will leak. What I want to know is how to efficiently and effectively display a string, without it leaking.

On a side note, how do you properly use IssueTargetOrderById. It seems the Ability ID isn't working...

its impossible to avoid that leak, at least as far as i know.

Is it not possible to preset a string?

using the (exact) same string again, wont leak again.

Each spell has got a order field. Use OrderId("order") with IssueTargetOrderById.

How do I convert the ability code into an order ID to be used with IssueTargetOrder.

search in forum for ConvOrder OrderString/Id Convertor