IntControl (59, p1, p2, 0, 0)
Sends a WM_SETTINGCHANGE message.
This IntControl sends a message to one or all application windows, informing them that a change has been made to the registry.
p1 = window handle of the window to send the message to, or -1 for all top-level windows.
p2 = name of the registry key that has been changed. Specify only the leaf node in the registry, not the whole path, but this will be application-dependent. You can specify a blank string ("") to request that the application re-read all sections or keys that affect it.
Returns @TRUE on success; @FALSE on error.