- * NON-PORTABLE!
- */
-
-void __fastcall__ pen_calibrate (unsigned char *XOffset);
-/* Ask the user to help to calibrate a lightpen. Changes the screen!
- * A pointer to this function can be put into mouse_adjuster.
- */
-
-void __fastcall__ pen_adjust (const char *filename);
-/* Get a lightpen calibration value from a file if it exists. Otherwise, call
- * pen_calibrate() to create a value; then, write it into a file, so that it
- * will be available at the next time that the lightpen is used.
- * Might change the screen.
- * pen_adjust() is optional; if you want to use its feature,
- * then it must be called before a driver is installed.
- * Note: This function merely saves the file-name pointer, and sets
- * the mouse_adjuster pointer. The file will be read only when a driver
- * is installed, and only if that driver wants to be calibrated.
- */