PS. For the not-so-faint-of-heart, open a Transcript and try evaluating:
|proc|
proc := [[Transcript show: 'Start!'. ] ensure: [Transcript show: 
'Finish!' Processor yield.]] newProcess.
proc resume.
Processor yield.
proc suspend.
proc terminate.

Why don't we get it printing?

Forgot a . there, supposed to be

|proc|
proc := [[Transcript show: 'Start!'. ] ensure: [Transcript show:
'Finish!'. Processor yield.]] newProcess.
proc resume.
Processor yield.
proc suspend.
proc terminate.

on my machine it prints:
Start!Start!Finish!

yay
Henry