Int 21 Fn 5F38  u - Named Pipes - Local DOSwaitnmpipe - Await Avail. Of P  [N]

   AX = 5F38h
   DS:DX -> pipe name
   BX:CX = timeout value

Return: CF clear if successful
   CF set if error
       AX = error code

Notes: when a client gets a return code of ERROR_PIPE_BUSY on attempting to
     open a pipe, it should issue this call to wait until the pipe
     instance becomes available again; on return from this call, the
     client must attempt to open the pipe once again
   this function was introduced by LAN Manager but is also supported by
     the Novell DOS Named Pipe Extender, Banyan VINES, OS/2 Virtual DOS
     Machines, and others

See Also: AX=5F37h,AX=5F39h