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A WINDOW, SYSTEM or IMAGE property. If the target is a WINDOW, PROP:Active returns 1 if the window is the active window, blank if not. Set to 1 to make the top window of a thread the active window.

If the SYSTEM variation is used, SYSTEM{Prop:Active} returns the number of active thread.

Setting PROP:Active to TRUE for an IMAGE control (runtime only) makes it active: it can be a parent/child of other controls and is painted separately without caching into the metafile of the owner window's background (i.e.,IMAGE controls with scroll bars).

**Example:**

** CODE**

** OPEN(Window)**

** X# = START(AnotherThread)        ! Start another thread**

** ACCEPT**

**  CASE EVENT()**

**  OF EVENT:LoseFocus              ! When this window is losing focus**

**   IF Y# <;> X#                    ! check for the first focus change**

**    Window{****PROP:Active****} = 1       ! and return focus to this thread**

**    Y# = X#                       ! then flag first focus change completed**

**   END**

**  END**

** END**

**AnyActiveThread PROCEDURE !lets any calling procedure know what thread**

**ActiveThread LONG,AUTO !is active.**

**CODE**

**ActiveThread = SYSTEM{****PROP:Active****}**

**RETURN CHOOSE(ActiveThread = THREAD(), 0, ActiveThread)**