Internal Category Numbers
When you create a category, the system represents the category internally by a halfword number. The system maintains category bit assignments to ensure that category numbers are assigned in ascending sequence. The number corresponds to a bit position in a Category bit map.
Category Bit Map
The runtime system maintains a category bit map for each user. The category bit map indicates the categories the user may access. When a user is granted access to a category, the corresponding bit in the category bit map is turned on.
The bit map is loaded on the first security request for a categorized resource which is internally secured. If none of the categorized resource types is internally secured, no category bit map will exist.
Security Check
When the user attempts to access a resource that is protected by category, the resource category is checked against the user's category bit map. Access is denied if the corresponding bit in the user's category bit map is off.
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