if (argc != 4) {
fprintf(stderr, "Error: Missing argument\n");
fprintf(stderr, "USAGE: %s PATH_WAIT_FILE PATH1_TO_OPEN PATH2_TO_OPEN\n", argv[0]);
if (argc != 4) {
fprintf(stderr, "Error: Missing argument\n");
fprintf(stderr, "USAGE: %s PATH_WAIT_FILE PATH1_TO_OPEN PATH2_TO_OPEN\n", argv[0]);