Indicates whether a particular unit is the active window in a
  QuickWin application.  It takes the following form:

  IOFOCUS = iof

  iof   Is a scalar default logical expression with
        one of the following values:

     .TRUE.    Indicates the QuickWin window is the active
               window
     .FALSE.   Indicates the QuickWin window is not the active
               window

  If unit '*' is specified, the default is .FALSE; otherwise, the
  default is .TRUE..

  A value of .TRUE.  causes a call to SETFOCUSQQ immediately before
  any READ, WRITE, or PRINT statement to that window.