[dist4]message_header // num_bytes
[u4]2 // version
[u4]0 // interface ID
[u4]1 // name
[u4]0 // flags
[u4]0 // padding
[u8]0 // request_id
[dist8]payload
[dist8]payload_interface_ids
[anchr]message_header
[anchr]payload
[dist4]method1_params // num_bytes
[u4]0 // version
[u4]0xFFFFFFFF // associated interface request: Unexpected invalid
// interface ID index.
[u4]0 // padding
[anchr]method1_params
[anchr]payload_interface_ids
[dist4]interface_id_array // num_bytes
[u4]3 // num_elements : It is okay to have IDs that are not
// referred to.
[u4]4
[u4]5
[u4]8
[anchr]interface_id_array