Mucking around with the API to enumerate all of the domain controllers in my area:

declare integer NetGetAnyDCName in NETAPI32 ; 
  STRING @servername , STRING @domainname , DOUBLE bufptr
  servername = .null.
  domainname = .null.
  bufptr = 400000
  nRetVal = NetGetAnyDCName(@servername,@domainname,bufptr)
  ? nRetVal

All I get is

'-1073741819'

. Any thoughts?