can ActiveHand be nil? Can I poll? With Slots?
- how about ActiveWorld?
- how about World?
- low space watcher via interruptName:preemptedProcess:
- #installNewWorld (no senders) via installForUIProcessReinstall
- #primitiveError: via #onPrimitiveError: via WorldMorph>>#install for errors while processing errors and drawing errors (the call chain that appears before the emergency evaluator
- Fold ActiveHand and primaryHand into CUIS activeHand
- Eliminate ActiveWorld - only World accessed via #world in Morph and PasteUpMorph
- Fold WorldState into WorldMorph