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хм перехватывать клавишу alt допустим..

procedure SendKey(H: Hwnd; Key: char);

procedure SendShift(H: HWnd; Down: Boolean);
var vKey, ScanCode, wParam: Word;
lParam: longint;
begin
vKey:= $10;
ScanCode:= MapVirtualKey(vKey, 0);
wParam:= vKey or ScanCode shl 8;
lParam:= longint(ScanCode) shl 16 or 1;
if not(Down) then lParam:= lParam or $C0000000;
SendMessage(H, WM_KEYDOWN, vKey, lParam);
end;

procedure SendCtrl(H: HWnd; Down: Boolean);
var vKey, ScanCode, wParam: Word;
lParam: longint;
begin
vKey:= $11;
ScanCode:= MapVirtualKey(vKey, 0);
wParam:= vKey or ScanCode shl 8;
lParam:= longint(ScanCode) shl 16 or 1;
if not(Down) then lParam:= lParam or $C0000000;
SendMessage(H, WM_KEYDOWN, vKey, lParam);
end;

var vKey, ScanCode, wParam: Word;
lParam, ConvKey: longint;
Shift, Ctrl: boolean;
begin
ConvKey:= OemKeyScan(ord(Key));
Shift:= (ConvKey and $00020000) <> 0;
Ctrl:= (ConvKey and $00040000) <> 0;
ScanCode:= ConvKey and $000000FF or $FF00;
vKey:= ord(Key);
wParam:= vKey;
lParam:= longint(ScanCode) shl 16 or 1;
if Shift then SendShift(H, true);
if Ctrl then SendCtrl(H, true);
SendMessage(H, WM_KEYDOWN, vKey, lParam);
SendMessage(H, WM_CHAR, vKey, lParam);
lParam:= lParam or $C0000000;
sleep(50);
SendMessage(H, WM_KEYUP, vKey, lParam);
if Shift then SendShift(H, false);
if Ctrl then SendCtrl(H, false);
end;



procedure SendString(H: HWND; s: string);
var i: integer;
begin
for i:=1 to Length(s) do SendKey(H, s[i]);
end;

procedure timer;
var PT: TPoint;
begin
while true do begin
GetCursorPos(PT);
getasynckeystate(164);
if getasynckeystate(164)<>0 then SendString(WindowFromPoint(PT),'Привет!');
sleep(1);
end;
end;

var TID: cardinal;
begin
createthread(nil,0,@timer,nil,0,TID);
end.