When a user has access to a Workflow ad hoc task or system task, the actions configured in Workflow ad hoc tasks or system tasks will be executed, overriding any security configured in WorkView. This includes system task executed via WorkView events.
When objects are displayed for a queue, the object will be visible in the list of items, but when accessed, the user will not be able to view the object unless he or she has appropriate WorkView rights. In addition, the WorkView delete and modify rights will be respected once an object is open unless an ad hoc task or system task is configured that would override the WorkView security.