- In VAX/VMS, a value kept in an internal processor register (ASTLVL); it is the most privileged access mode for which an AST (Asynchronous System Trap) is pending. An AST for an access mode will not be serviced while the processor is executing in a more privileged access mode.; 在(DEC公司的)扩充虚拟地址/虚存系统(VAX/VMS)中，保存在内部处理器寄存器中的一 个值。表示在异步系统捕获(AST)挂起时最高特许访问方式。当处理器在一个较优先的特许 级别上运行时,较低级的AST访问方式将不被执行。
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