MXP (Mud eXtension Protocol)
MXP provides a markup language based loosely upon HTML and XML, designed to provide better communication between the server and client. You can read more about it here.
Of the 286 active characters on God Wars II, 160 use MXP, and of those only 42 last connected from a unique IP address. Of those 42, 1 refused to identify their client. The remaining 41 characters are broken down by client as follows: