[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]1                  // associated interface request: 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