Saving a continuation

[pacbell!att-ih!alberta!calgary!jameson@AMES.ARC.NASA.GOV (Kevin Jameson)]

When a continuation is saved, what else must be preserved?  
  1) Surely the stack history prior to the save?
  2) The environment at the time of the save (this is not done, as far as
      I can figure out)
  3) Anything else?

Thanks 
  Kevin  ...!{ihnp4,ubc-vision}!alberta!calgary!jameson