Casio IT-2000W - Manual (Page 101)

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7.5.2 Startup Method
The PenMouse driver can be loaded by specifying as follow at [boot] section of SYSTEM.INI.
However, it is loaded automatically to F-ROM drive (D: ) when Windows is installed by using the
Windows installer. SYSTEM.INI is also created automatically. The driver is supplied as an SDK.
Format:
[boot]
......
mouse.drv=penmouse.drv
Note:
If the above format is deleted from SYSTEM.INI or from PENMOUSE.DRV, the mouse operations
on Windows cannot be performed.