Executive — I/O Manager
	• The I/O manager is responsible for – file systems – cache management – device drivers – network drivers • Keeps track of which installable file systems are loaded, and manages buffers for I/O requests • Works with VM Manager to provide memory-mapped file I/O • Controls the XP cache manager, which handles caching for the entire I/O system • Supports both synchronous and asynchronous operations, provides time outs for drivers, and has mechanisms for one driver to call another