Offset Type     Name             Description
------ -------- ---------------- ------------------------------
 0000  BYTE     cmd
 0001  USHORT   size
 0003  USHORT   messagetype      if 0x03EB : Display Enter Username window

messagetype==0x03EB
 0005  BYTE[8]  unknown          all 0x00

messagetype==0x03EB
 0005  UNI[30]? username         unicode username
 0065  UINT     unknown          all 0x00  (String terminator?)

messagetype==0x03E8
 0005  BYTE[4]  unknown          all 0x00
 0009  UNI[]    channel          unicode channel name
       BYTE[2]  unknown          0x0000 
       BYTE[2]  unknown          0x0030 
       BYTE[2]  unknown          0x0000 

Messagetype

• 0x03EB : Display Enter Username window
• 0x03ED : Username accepted, display window
• 0x03E8 :