## Physical Device Driver Reference

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### IORESOURCE Field - IOFlags

IOFlags (USHORT) One of the following sharing mode flags must be specified:

RS_IO_EXCLUSIVE
RS_IO_MULTIPLEXED
RS_IO_SHARED
RS_IO_GRANT_YIELD

See Managing System Resources for a description of resource sharing modes.

If a search is to be performed, the following flag must be specified:

    RS_SEARCH

When a search is performed and is successful, the BaseIOPort field will be updated to indicate the start of the allocated I/O Port range.

The port range returned will be aligned on 2^n boundary >= NumIOPorts.