#include <stdio.h>
#include <X10/Xlib.h>

#define PLX_ID	1101
#define DISPLAY_IS_PLX	( DisplayType() == PLX_ID ? 1 : 0 )

main()

{

	XOpenDisplay(NULL);

	if( DISPLAY_IS_PLX ) 
	printf("I am running on a Parallax.\n");
	
	else
	printf("I am NOT running on a Parallax.\n");
}