REXX programming or Restructured Extended Executor is a structured general-purpose programming language used by programmers across the world. This high-level IT language was first developed by IBM Fellow Mike Cowlishaw, and it is known for its efficiency.
Mainframes vs. servers–if you’re expecting a magic bullet explanation of how they differ, you’re in for a surprise. They look about the same, they have the same sort of technology, but where they differ is in scale.
Trying to compare mainframes to servers is like asking what’s the difference between an apple and a bushel of apples. Or ants and Godzilla. Who said we IT types aren’t creative.