There isn't even an application form. Still, immigration gave the traveller B-1 status. Reduce risk with company supporting letter. Joe Grasmick shows a client the three ways to get B-1 status. Appear at the border, and state the purpose of the trip.
Immigration lets the employee in with no paperwork created.
Prepare the letter before you're ever asked for it. This is a form which shows eligibilty for B-1 status for a period of one year. Since a supervisor authorizes this, showing this form every time the employee crosses the border makes multiple entries easier. There is much more information about B-1 status in this Web site. A second way to use immigration to your advantage, is to get work permission.