Some comments on what this is doing.

php/go.php

@@ -6,18 +6,18 @@
 	 
 	 **/
 
-	if (isset($_GET['k'])) {
+	if (isset($_GET['k'])) { // Mandatory Component 1 - The clients secret salt.
 
 		$ClientSalt = $_GET['k'];
 		settype($ClientSalt, "string");
 		$ClientSalt = substr($ClientSalt,0,128); // Anti-Buffer-Overflow protection... maybe?
 		
 	}
 
-	if (isset($_GET['dhcp'])) {
+	if (isset($_GET['dhcp'])) { // Optional Component - The clients IP Address
 
 		$dhcpPreference = $_GET['dhcp'];
-		settype($dhcpPreference, "integer"); 
+		settype($dhcpPreference, "integer"); // numbers only, 1 = on ... anything else = off.
 
 		if ($dhcpPreference = 1) {
 
@@ -35,17 +35,22 @@
 	}
 
 	if (!$DHCP) {
-		if (getenv(HTTP_X_FORWARDED_FOR)) {
-			$IP = getenv(HTTP_X_FORWARDED_FOR);
+		if (getenv(HTTP_X_FORWARDED_FOR)) { // Proxy Server Detection/
+			$IP = getenv(HTTP_X_FORWARDED_FOR); // Proxy
 		} else {
-			$IP = getenv(REMOTE_ADDR);
+			$IP = getenv(REMOTE_ADDR); // No Proxy.
 		}
 	}
 
+
+		// Mandatory Component 2 - The Clients User Agent String.
 	$UserAgent = getenv(HTTP_USER_AGENT);
 	$Numbers = array("1", "2", "3", "4", "5", "6", "7", "8", "9", "0");
-	$UserAgent = str_replace($Numbers, '', $UserAgent);
+	$UserAgent = str_replace($Numbers, '', $UserAgent); // We strip version numbers to produce the same results after upgrades.
+
+
 
+		// Output.
 	header("Content-Type: text/plain");
 
 	echo "$ClientSalt \n";