Hello George,
thought you might be interested, this is what I ended up with ;

LPARAMETERS pcUser, pcMessage
DECLARE INTEGER NetMessageBufferSend IN netapi32 ;
  STRING servername, STRING UserName, STRING fromname, ;
  STRING MessageBuf, INTEGER buflen
lcUser    = strconv( StrConv(pcUser,1), 5) + Chr(0)
lcMsg     = strconv( StrConv(pcMessage,1), 5) + Chr(0)
lcFrom    = strconv( Strconv(Sys(0),1), 5) + Chr(0)
lnLen     = len(lcMsg)
res = NetMessageBufferSend( 0, lcUser, lcFrom, lcMsg, lnLen )
RETURN res

thanks for your help

Pete Kane