The Amiga connection is bogus - wikipedia isnt the truth.
The article they link to says "Commodore licensed IBM's REXX scripting language for inclusion in their AmigaOS, and IBM took many GUI design ideas from the AmigaOS for their new GUI.", which also is bogus. IBM didn't own the REXX scrupting language, ARexx was made by William S. Hawes, and that's what Commodore got. Look up ARexx on wikipedia as well.
It's scary to read wikipedia on topic one actually know something about, probably the quality of the rest of wikipedia is equally bad.