Pegando nome do usuário na rede

Function TForm1.usuario : string;
var
szNetName: Array[0..48] of Char;
iResult: DBIResult;
begin
iResult:= DBIGetNetUserName(szNetName);
if iResult <> DBIErr_None then
DBIError( iResult )
else
Result:= StrPas(szNetName);
end; {Colocar na Uses : DBITYPES, DBIPROCS, DBIERRS, DBTables e DB. }