Yes, it can be done with a script triggered by the save of the order/invoice.  However, there is a product called Sale Alerts and Workflow that allows you to set up email alerts and reports easily, without scripting.  I recommend that product.

Sage 100 can't auto-email a form, but any 3rd party ODBC reporting tool can do this.  SA&W, Visual Cut... although you have to redesign your reports to run without using work tables (since those are only available when used with the associated Sage 100 printing program).

Have done this with Sage Alerts and Workflow, lots of people have.