VARIABLE(9)                                           VARIABLE(9)

          variable - interrogate a button variable

          variable var ?value?

          Variable queries or sets the value of a Tk radiobutton,
          checkbutton or choicebutton variable.  An error diagnostic
          will be returned if the variable is of the wrong type (if
          for instance it is the name of a named channel).

          If value is given, the value of the variable is set to that
          value, and any associated buttons will subsequently reflect
          this in their appearance.  Omitting the value argument
          returns the current value of the variable.

          The special variable lasterror holds the text of the last Tk
          error encountered.  It resets when queried.

          checkbutton(9), choicebutton(9), radiobutton(9)

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