MQL5 WindowHandle() error message -> (function not defined)

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UserMQLSite
121
UserMQLSite  

Why is this function not defined?

if i try to compilere the file i get that error, but in the mql5 book they show this function WindowHandle()?

Alain Verleyen
36734
Alain Verleyen  
UserMQLSite:

Why is this function not defined?

Because there is no such function in mql5 !

if i try to compilere the file i get that error, but in the mql5 book they show this function WindowHandle()?

Really, where ?
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