procedure TForm1.Button1Click(Sender: TObject);
var
test : Set of TIdIRCUserMode;
modes : Array[1..3] of TIdIRCUserMode;
i:Integer;
blah : TIdIRCUsermode;
begin

test := [aminvisible, amAway];

modes[1] := aminvisible;
modes[2] := amAway;
modes[3] := blah;  // absichtlich etwas angeben, was nicht im stanni array ist!


for i:= 1 to 3 do
 if modes[i] in test
 then showMessage(IntToStr(i)+' is in Test')
 else showMessage(IntTostr(i)+' is not in Test');

end;