// Add default options to be set by shortcodes:
add_option ('shortcode-test', 'Shortcode Default');
add_option ('shortcode-include-test', 'Shortcode Include Default');

// Shortcode A:
function shortcode_a(){
	update_option('shortcode-test', 'Shortcode A');
	$output = get_option('shortcode-test');
	$output .= " Shortcode A";
	return $output;
}
add_shortcode('shortcode-a', 'shortcode_a');

// Shortcode B:
function shortcode_b(){
	update_option('shortcode-test', 'Shortcode B');
	$output = get_option('shortcode-test');
	$output .= " Shortcode B";
	return $output;
}
add_shortcode('shortcode-b','shortcode_b');

// Shortcode Test:
function shortcode_test() {
	$output = "shortcode-test = " . get_option('shortcode-test') . "<br/>";
	$output .= "shortcode-include-test = " . get_option('shortcode-include-test');
	return $output;
}
add_shortcode('shortcode-test', 'shortcode_test');

// Shortcode Include One:
function shortcode_include_one_test() {
	include('shortcode-include-one.php');
	return shortcode_include_one();
}
add_shortcode('shortcode-include-one', 'shortcode_include_one_test');


// Shortcode Include Two:
function shortcode_include_two_test() {
	include('shortcode-include-two.php');
	return shortcode_include_two();
}
add_shortcode('shortcode-include-two', 'shortcode_include_two_test');


/* shortcode-include-one.php */

function shortcode_include_one() {
	update_option('shortcode-include-test', 'Shortcode Include One');
	$output = get_option('shortcode-include-test');
	return $output;
}

/* shortcode-include-two.php */

function shortcode_include_two() {
	update_option('shortcode-include-test', 'Shortcode Include Two');
	$output = get_option('shortcode-include-test');
	return $output;
}