Things to do yet:

 Wimp2:
 -=-=-=
 * Investigate poll code 0 being returned by Wimp2_Poll when a 4 or 5 is
received by Wimp_Poll but is masked out under Wimp2 (summat to do with that
hourglass service call methinks)
 * Implement sleep function.
 * Implement thread support.
 * Implement Wimp2_KillProcess.
 * Implement memory protection. RO4 does much of this already though.
 * Multiple app use of the hourglass (perhaps use old tornado hourglass
   module?)
 * Finish implementing Wimp2_ReportError, a multitasking error report box.
