True, it's older than that, but I didn't recall exactly when it became universal across all significant contemporary OSes. I don't know what Amiga Workbench used, for example. Figured Win95-era was a conservative guess.
When the IBM PC took over basically, but interestingly they used the Mac as a starting point, since Microsoft had been using the keys. MS learned GUI programming on the Mac before they developed Windows. Hence the lawsuit Apple lost.
Motif/CDE said “good enough” as well. IBM even backported some to its mainframes and minis.
