Basically the Workflow fires on a user event and then calls any script in an order you want after that

bmeier:

Important User event scripts cannot be executed by other user event scripts or by workflows with a Context of User Event Script. In other words, you cannot chain user event scripts. You can, however, execute a user event script from a call within a scheduled script, a portlet script, or a Suitelet.

Good to know. Thanks for the clarification!