I'm working on modernizing Rosetta Code's infrastructure. Starting with communications. Please accept this time-limited open invite to RC's Slack.. --Michael Mol (talk) 20:59, 30 May 2020 (UTC)


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R4 is an implementation of REXX. Other implementations of REXX.

r4™ is an implementation of the REXX interpreter for the Microsoft Windows platform, available at no charge from Kilowatt Software L.L.C.