Opening and closing an application program

This chapter describes aspects of the OPEN, CLOSE, and ACB macroinstructions that apply to all application programs. If the application program uses special functions that require authorization or that are operating system dependent, additional considerations apply. See Operating system facilities, and Coding for the communication network management interface, for additional information.

For multiple, identical application programs that provide the same function and that are known and accessed by a single generic name, see Opening and closing an application program as a generic resource.