Listing 2 A non-extensible version of the header file API.H in Listing 1

/* API.H */
int DefineHotSpot (int id, int x1, int y1, int x2, int y2);
.
.
.
/* Application */
#define ID_HELP_BUTTON 10

DefineHotSpot (ID_HELP_BUTTON, 10,20,50,40);
/* End of File */