mred:get-choice

• (mred:get-choice message true false title x y) -> boolean
      message : string
      true : string
      false : string
      title = "Warning" : string
      x = -1 : small integer
      y = -1 : small integer

  Gives the user a two-button dialog with the buttons labelled using the strings true and false. If the true button is hit, #t is returned; otherwise, #f is returned. The message string is displayed in the dialog; this string can contain newline characters to create multiple lines of text in the dialog. The title string is used as the frame title for the dialog. The x and y arguments optionally specify a position for the dialog; if they are both -1, the dialog is cenetered on the screen.

  The parent for this dialog defaults to the currently active frame.