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Yeah, the main references I found to IVR systems and REXX were from IBM articles discussing IVR, and some open-source Asterisk-based systems using ooRexx that appear to have been created as an open-source alternative to IBM OS/2 IVR solutions that used REXX.

OS/2 is the primary environment where I had experience reading and writing REXX a long time ago. I was also aware of it being used in IBM mainframe systems, but I had no direct experience there.

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My last experience with IVR and REXX was setting up a system in the mid-2000s to do identity verification for loan applicants. I can't remember the name of the software. It ran on Windows server and wasn't an IBM product.

I also used REXX on OS/2 systems including doing some development using Watcom VX-REXX which you can basically think of as Visual Basic but with REXX. I released a GUI FTP program I developed with it to the OS/2 BBS but last I looked couldn't find it in the OS/2 BBS archives.

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