typedef struct Cursor Cursor; typedef struct Cursorinfo Cursorinfo; struct Cursorinfo { Cursor; Lock; }; extern Cursorinfo cursor; extern Cursor arrow; extern int cursoron(int); #define cursoroff(x) extern Point mousexy(void); void setcursor(Cursor*); void mousectl(char*[], int); void mousetrack(int, int, int); void blankscreen(int);