The APPC/z/OS/OS/390 component is a cooperative processing interface available for OS/390/ESA 4.2.0 and above. Cooperative processing refers to the ability of application programs to establish communications with partner programs on other systems and within the same system (such as when testing is required). This allows for the sharing of work, data, and services between systems and across networks. With APPC/OS/390, transaction programs (TPs) on one z/OS or OS/390 system can initiate (allocate) conversations with other TPs on different systems throughout an SNA network.
Depending on the nature of the TPs, the data being shared, and on the comparative security environments of the partner z/OS systems (that is, one z/OS or OS/390 system is secured by CA Top Secret in FAIL mode while another z/OS system is not secured at all); there is the potential for security exposures.
Note: In an unprotected network, the only information a TP requires to initiate a conversation with another TP is the name of that TP and the Logical Unit (LU) on which that TP is located.
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