Windows PCs were once run ONLY on CPUs made by Intel: computer chips with names like 8086, 80186, 80286, 80306, 80486, and Pentium. (I guess their legal department figured out they can't trademark a number.) Each new generation offered new capabilities that would only benefit new software that was specifically written for it.
Or can it? What if you wrote some clever software that would examine all the executables on your hard drive and optimize them to take advantage of the Pentium's new features? That's what this idea was.
Download the 3-page idea description at https://friedmanarchives.com/~download/blog/Pentium_recompiler.pdf for further details.
Notice the thought at the end that it might be possible to buy things online one day once certain technical challenges regarding secure payments are overcome. Once again, I get no credit for thinking of it first. :-(