Retrieves next available MGUI event waiting for it if desired
Retrieves next available MGUI event waiting for it if desired. The event is returned in the buffer pointed to by 'pe'. This structure must be allocated by the calling function. The second argument specifies, with a boolean value, whether the caller wants to wait for an event or not. If no pending event is found and 'wait' equals 0, the function returns immediately and sets the 'type' field of the MEvent structure to E_NO_EVENT.
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