h6. [[OS SWI Calls]] h6(. » [[OS_Args]] h6((. » [[OS_Args 9]] h6(((. » IOCtl Parameter Block table(). |_. Offset |_. Contents |_. Notes| |0-1|[[IOCtl Reason Codes]]|| |2|IOCtl group code || |/2^. 3|Bit 6 = read|| |Bit 7 = write|| |4|Data|Size of data is reason code dependent| h4. See also * [[IOCtl Reason Codes]] * [[OS_Args]] * [[OS_Args 9]]