Push Buttons

  Push buttons are square buttons in dialog boxes or
  applications that let you tell DECwindows what to do with the
  information you supplied in the dialog box.  To perform the
  action indicated by the push button, move the pointer to the
  push button and click MB1.

  A double border around a push button indocates that it is the
  default options.  To activate this push button, move the pointer
  to the push button and click MB1.