## Pen for OS/2 Device Driver Reference

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### Category 90h - Driver IOCtls

The following are Category 90h - Driver IOCtls:

Function 50h - Set Unit Specific Data
Function 51h - Set Unit Variable
Function 52h - Reset Trace Table
Function 53h - Set Trace Table Size
Function 60h - Query Unit Specific Data
Function 61h - Query Unit Variables
Function 62h - Query Unit Capabilities
Function 63h - Query Trace Table
Function 64h - Query Trace Table Size