Int 64 Fn 06  U - Bw-nfs - Bwrpc - ???                                     [N]

   AH = 06h
   ES:SI -> ???

Return: AL = 00h if CF clear
Range: INT 4E to INT FD, selected by configuration

Note:  this call is passed directly through to INT 62/AH=14h

See Also: INT 62/AH=14h"ETHDEV"