guard page exception
Operating system warning condition which occurs when an application accesses memory within a page which has been declared as a guard page. This exception may be trapped using an exception handler registered by the application in order to handle such occurrences. The typical processing performed by the exception handler is to commit more memory within the memory object. If an exception handler is not registered, the operating system's default handler commits the next available page within the memory object and sets its attribute to PAG_GUARD.