[NIch]

Есть парочка вариантов...взято с проекта DelphiWorld6...

Получаем заголовок чужого компонента, который под мышью
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procedure TForm1.Timer1Timer(Sender: TObject);
var
s: string;
h: HWND;
begin
h := WindowFromPoint(Mouse.CursorPos);
SetLength(s, SendMessage(h, WM_GETTEXTLENGTH, 0, 0)+1);
SendMessage(h, WM_GETTEXT, length(s), Integer(PChar(s)));
SetLength(s, lStrLen(PChar(s)));
Label1.Caption := s;
end;
Некрасиво то, что вся эта ерунда висит на таймере...

еще...

Классы главных форм популярных программ
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Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

Every window is a member of a window class. When you use API functions suchs as FindWindow, ShowWindow,..., you need the classname as parameter to specify the window class name.
Below are some class names of common applications that are included in Windows.

Class Name Application

Omain ACCESS.EXE
SciCalc CALC.EXE
CalWndMain CALENDAR.EXE
Cardfile CARDFILE.EXE
Clipboard CLIPBOARD.EXE
Clock CLOCK.EXE
CtlPanelClass CONTROL.EXE
XLMain EXCEL.EXE
Session MS-DOS.EXE
Notepad NOTEPAD.EXE
pbParent PBRUSH.EXE
Pif PIFEDIT.EXE
PrintManager PRINTMAN.EXE
Progman PROGMAN.EXE (Windows Program Manager)
Recorder RECORDER.EXE
Reversi REVERSI.EXE
#2 SETUP.EXE
Solitaire SOL.EXE
Terminal TERMINAL.EXE
WFS_Frame WINFILE.EXE
MW_WINHELP WINHELP.EXE
#2 WINVER.EXE
OpusApp WINWORD.EXE
MSWRITE_MENU WRITE.EXE

Below are some class names of applications that are new with Windows 95:

Class Name Application
-------------------------- --------------------------
CabinetWClass My Computer Window
Internet Explorer_Frame IEXPLORE.EXE
MSPaintApp MSPAINT.EXE
SageWindowClass System Agent Com Window
Shell_Traywnd Windows 95 Task Bar
WordPadClass WORDPAD.EXE
DialerClass DIALER.EXE
SJE_CDPlayerClass CDPLAYER.EXE
MyDlgClass CHARMAP.EXE
MSDefragWClass1 DEFRAG.EXE
GFVMainWndClass FAXVIEW.EXE
FreeWClass FREECELL.EXE
Mplayer MPLAYER.EXE
AfxFrameorView HEARTS.EXE
NW_Class NETWATCH.EXE
AppClass PACKAGER.EXE
System Policy Editor POLEDIT.EXE
PWLEdit PWLEDIT.EXE
RegEdit_RegEdit REGEDIT.EXE
ScanDskWDlgClass SCANDSK.EXE
SoundRec SNDREC32.EXE
Volume Control SNDVOL32.EXE
System Monitor SYSMON.EXE
MSTaskSwWClass TASKMAN.EXE
TelnetWClass TELNET.EXE
WinIPCfgClass WINIPCFG.EXE
WordPadClass WORDPAD.EXE
Session_Window HYPERTRM.EXE