To simulate a server UAP that uses an XATMI interface for accepting service requests, the user must first create an XATMI response data file with the response data to be returned to the client UAP. When the client UAP sends a service request, the offline tester reads the response data from the file and returns it to the client UAP.

When service requests are made interactively, the user must also create an XATMI receive data file containing the test data to be received by the client UAP during service execution. If the client UAP passes send data, the offline tester makes a file name inquiry for each service. Using an offline tester command, the user specifies the name of an XATMI send data file for saving the send data.