## Presentation Device Driver Reference for OS/2

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### SplUnRegister Parameter - ulType

ulType (ULONG) - input Type of alert to unregister for the given category.

If the category is PRTALERT_CATEGORY_CORE, then this is a bit-field that defines the core alerts to unregister.

If the category is not PRTALERT_CATEGORY_ALL, PRTALERT_CATEGORY_CORE, PRTALERT_CATEGORY_ALL_CORE, or PRTALERT_CATEGORY_ALL_EXT, this is a value that defines the specific extended alert to unregister.