You first enable the console terminal (TTP) and associate the programmable asynchronous line controller (PAS) and magnetic tape controller (MT) to avoid device number conflicts.

An asynchronous message is drawn similar to a synchronous one, but the message's line is drawn with a stick arrowhead, as shown in Figure 6.

In this article, you learned a few asynchronous communication techniques and how you can add JSON and Ajax to business-line applications through reusable JSP TagLib controls.