The IUCV line driver supports the IUCV SEND/REPLY and the SEND 1WAY protocols, allowing the Entire Net-Work administrator to select the environments most appropriate for the node.

• The SEND/REPLY protocol is most appropriate for environments with heavy two-way traffic. In most cases, you will find the SEND/REPLY protocols to be advantageous.

• The SEND 1WAY protocol may be more appropriate for light message traffic, or where returning messages are routed through another link.

  The Entire Net-Work IUCV line driver uses established and documented interfaces to ensure mutual use of IUCV services by different applications.

• Where supported in guest operating systems, Entire Net-Work uses the VCNA macro VSIUCV.

• In z/VSE environments with 370 mode supervisors, Entire Net-Work IUCV adheres to the principles of the Cross Product Interface (CPI). For more information about CPI, contact your Software AG technical support representative.

Products that do not support the interfaces and macros mentioned above cannot be used simultaneously with Entire Net-Work IUCV. If used, unpredictable results can occur. Such results may include operating system-disabled waits, abnormal termination, or indefinite wait situations in user programs, Entire Net-Work Communicators, or user targets.