Look into REXX in MVS/TSO

Saw it mentioned it the TK5 manual (TK5-Introduction-and-User-Manual). Which also said…BREXX is a nearly fully compatible clone of IBM’s REXX. Samples here BREXX.V2R5M2.SAMPLES. Saw Primes. How do I execute it. I saw something like RX ‘BREXX.V2R5M2.SAMPLES(PRIMES)’. So I dropped down to TSO and I tried RX PRIMES. I took a chance that the “path” was …