Int 15 Fn DE29  U - Desqview/x - Get Display Name                          [Q]

   AX = DE29h
   BX = 0004h
   CX = size of buffer in bytes
   DX = segment of window handle
   ES:DI -> buffer for display name

Return: CF clear if successful
       buffer filled with ASCIZ display name (truncated if necessary) or
         null string if no display
   CF set on error

Notes: DESQview 2.50-2.52 are distributed as part of DESQview/X v1.0x.
   the name ":0" refers to the local display