Int 21 Fn 5F35  u - Named Pipes - Local Dospeeknmpipe                      [N]

   AX = 5F35h
   BX = handle
   CX = buffer length
   DS:SI -> buffer

Return: CF set on error
       AX = error code
   CF clear if successful (LAN Manager v1-v2)
   AX = 0000h if successful (LAN Manager 3.x)
   ---if successful---
       CX = bytes read
       SI = bytes left in the pipe
       DX = bytes left in the current message
       AX = pipe status (v1-v2) (see #1389)
       DI = pipe status (v3.x)

Note:  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=5F38h,AX=5F39h,AX=5F51h

(Table 1389)
Values for pipe status:
 0001h disconnected
 0002h listening
 0003h connected
 0004h closing