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Summary

The SetLayeredWindowAttributes API

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static extern bool SetLayeredWindowAttributes(IntPtr hwnd, uint crKey, byte bAlpha, uint dwFlags);

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Public Declare Auto Function SetLayeredWindowAttributes Lib "User32.Dll" _

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Function Long SetLayeredWindowAttributes(long hWnd, Long crKey , char /*Byte*/ bAlpha , Long dwFlags) &

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    Library "user32" alias for "SetLayeredWindowAttributes;Ansi"

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        SetLayeredWindowAttributes(Handle, 0, 128, LWA_ALPHA);

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  SetLayeredWindowAttributes (ll_handle, 0, char(128),LWA_ALPHA)

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Documentation

[SetLayeredWindowAttributes] on MSDN