2.2.1.2 RDP-UDP2 Optional Payloads
The following optional payloads are exchanged over the RDP-UDP2 packet. The presence of each of these optional payloads is indicated by the Flags field in the RDP-UDP2 packet header (section 2.2.1.1). Each RDP-UDP2 packet MUST contain one or more of the optional payloads in addition to the header.