Info:CanErase: public: logical
  If true and the viewed text was sent to print (i.e. if Info:Printed is
  true), the system by finishing of this task asks for validation if the file
  can be erased and if yes it is erased. If the file was sent to print it was
  written to temporary file and this file was printed by Print command.
  This instvar variable refers if the file should be erased or no.