The display, screen, visual, visual depth etc. can be retrieved using the following functions.
void EZ_GetDisplayInfo(Display **dpy, int *scrn,
Visual **vis, int *depth);
Colormap EZ_GetColormap();
void EZ_GetDisplaySize(int *w, int *h);
Display *EZ_GetDisplay(); /* return the display */
Visual *EZ_GetVisual(); /* return the visual */
int EZ_GetDepth(); /* return the v depth */
int EZ_GetScreen(); /* return the scrn # */