Body allows the code for a method to be created outside the class definition (or to be replaced outside).

  package require Itcl
  itcl::class helloworld {
    public variable owner "No-one"

    method greet {} { puts "Hello World from $owner" }
  }

  helloworld  h1
  h1 configure -owner Me
  h1 greet
  # change the behaviour of helloworld
  itcl::body helloworld::greet {} { puts "Goodbye Cruel World from $owner" }
  h1 greet

Will use the original greet (Hello world...) up to the itcl::body command. Then greet is replaced.

Commonly used to prevent class definitions becoming too long to read - a long method should be placed outside the class definition as an itcl::body.

GWM

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