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Introducing the Architected Interface Facility: Procedure Exits by Beth Eikenbary Commercial Systems Division The Architected Interface Facility: Procedure Exits (AIF: PE) is a product that provides you with the ability to replace or augment system functionality on MPE XL. It does this by letting you specify certain procedures to be executed in place of, or in addition to, existing procedures within system or user code/applications in Compatibility and Native Mode. This specification may either be done on a system-wide or a process-local basis, allowing you to limit the scope of effect. It is a general product that may be used by any software developer, including HP subsystem developers. It is primarily targeted for use by 3rd party applications developers who need to augment MPE XL operating system functionality. AIF: PE solves the needs of our 3rd party development partners by allowing run-time interception of MPE XL procedures residing in the NL.PUB.SYS or other system libraries. This functionality is required to help many 3rd parties complete the migration of their products to MPE XL. This functionality already exists on MPE V/E to some extent in that developers can, and do, replace segments of its systems library, SL.PUB.SYS, with their own code. In addition to allowing these 3rd parties to migrate MPE V/E products to MPE XL, AIF: PE functionality has been specifically requested by many other 3rd party developers and end user customers as a means for optimizing MPE XL functionality to meet their specific requirements. The AIF: PE product can be ordered directly from Hewlett-Packard as of this release. The product number is HP36429A. End users who are utilizing a 3rd party application that requires the AIF: PE need not purchase the product. Prior to shipping AIF: PE to a software developer, the customer will need an AIF User_ID. A User_ID can be obtained by the Customer Sales Representative calling the Sales Response Center and requesting a AIF User_ID. Only one User_ID is required for the family of Architected Interface Facility products, so the User-ID obtained for the AIF: OS or AIF: MI products can be used with AIF: PE.