## 13.5.14 IOFOCUS Specifier (WNT, W9*)

The IOFOCUS specifier asks if the indicated unit is the active window in a QuickWin application. It takes the following form:

  IOFOCUS = iof
  iof
  Is a scalar default logical variable that is assigned one of the following values:

  .TRUE. | If the specified unit is the active window in a QuickWin application
  .FALSE. | If the specified unit is not the active window in a QuickWin application

If you use this specifier with a non-Windows application, an error occurs.

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