Hi, Rob,
I found this old manual (Redbook) that mentions it on page 35:
   
https://www.krsaborio.net/unix/research/acrobat/9511-a.pdf ;
Also, google says:
Based on the provided information, 5798-RZB IBM Connection Program/400 for UNIX Environments appears to be a specific product or component enabling interaction between IBM's AS/400 (also known as IBM iSeries or System i) and UNIX-based systems. Here's what the search results suggest about its function:   
   - Facilitates communication and resource sharing: 5798-RZB, along with 5798-TBE for RISC architectures, allows IBM AS/400 to share resources like printers and perform file transfers with various UNIX workstations, including IBM AIX, Solaris Sparcstations, and HP 9000 series machines.
   - Utilizes TCP/IP and APPC/SNA: This communication between AS/400 and UNIX environments is achieved through the use of TCP/IP and APPC/SNA communication protocols.
   - Focuses on connectivity and integration: The program's name itself, "Connection Program/400 for UNIX Environments", signifies its purpose in enabling connectivity and integration between these different operating systems. 
In essence, 5798-RZB IBM Connection Program/400 for UNIX Environments seems to be a solution designed to bridge the gap between the IBM AS/400 and UNIX systems, allowing them to communicate and share resources effectively. An interesting old find.   Perhaps SAVLICPGM to a save file for posterity? 
All the best,
Mark S. Waterbury
   > On Saturday, July 19, 2025 at 08:57:54 PM EDT, Rob Berendt <robertowenberendt@xxxxxxxxx> wrote:  
 
 Working on a system which has had various people working on it over the
years.  It is currently at 7.2.  I will bring it up to 7.4 and then 7.5.
One of the LPP's on it that I am finding is
5798RZB  *BASE    5001    IBM Connection Program/400 for UNIX Environments
Release:  V2R2M0
I'm assuming this is just something left over from way back and can't
possibly be in use, right?
Library is QEUX
There are no locks for WRKOBJLCK OBJ(QEUX) OBJTYPE(*LIB)
Can I just delete this LPP?  Is this something which predates TC1 or some
such thing?
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