it's a suitelet that does a saved search on invoices where email, project email, sales rep and project rep can be edited. after editing, you can select invoices to send to the scheduled script. currently, there are parameters for a list of internal ids and whether or not to send out emails. for each invoice, a custom module prints to the file cabinet in the scheduled script. if the send emails checkbox was selected, it attempts to send emails for all, and succeeds if they have an email address specified.