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Returns the thread number of a window. This is not necessarily the currently executing thread, if you've used SETTARGET to set the TARGET built-in variable. (READ-ONLY)

**Example:**

**WinView   WINDOW('View'),AT(0,0,320,200),MDI,MAX,HVSCROLL,SYSTEM**

**      END**

**ToolboxThread BYTE**

** CODE**

** OPEN(WinView)**

** ToolboxThread = ToolboxWin{PROP:Thread}   !Get window thread number**

** ACCEPT**

** END**