Нажатие клавиши F1 
 В обработчике событий OnKeyDown: 

 procedure TForm1.FormKeyDown(Sender: TObject; var Key: Word; 

Shift: TShiftState); 
 begin
 if key = VK_F1 then   {список кодов клавиш представлен ниже}
 begin
 {действие}
 end;
 end; 

Использование кнопки ENTER 
В обработчике событий OnKeyPress:

procedure TForm1.KeyPress(Sender: TObject; var Key: Char); 
 begin 
 if key = #13 then 
   begin 
 key := #0; 
 {действие}
 end;
 end; 

Нажатие сочетания клавиш Ctrl+Shift 
В обработчике событий OnKeyDown:

procedure TForm1.FormKeyDown(Sender: TObject; var Key:Word; 

Shift: TShiftState); 
  begin 
 if (ssCtrl in Shift) and (ssshift in Shift) then 
 begin 
 {действие}
 end; 
 end; 

Virtual Key Code

VK_LBUTTON             Left mouse button 
VK_RBUTTON             Right mouse button 
VK_CANCEL               Control+Break 
VK_MBUTTON            Middle mouse button 
VK_BACK                   Backspace key 
VK_TAB                      Tab key 
VK_CLEAR                  Clear key 
VK_RETURN                Enter key 
VK_SHIFT                   Shift key 
VK_CONTROL             Ctrl key 
VK_MENU                    Alt key 
VK_PAUSE                  Pause key 
VK_CAPITAL               Caps Lock key 
VK_ESCAPE                Esc key 
VK_SPACE                  Space bar 
VK_PRIOR                   Page Up key 
VK_NEXT                     Page Down key 
VK_END                      End key 
VK_HOME                   Home key 
VK_LEFT                     Left Arrow key 
VK_UP                        Up Arrow key 
VK_RIGHT                   Right Arrow key 
VK_DOWN                  Down Arrow key 
VK_SELECT                 Select key 
VK_PRINT                   Print key (keyboard-specific) 
VK_EXECUTE              Execute key 
VK_SNAPSHOT            Print Screen key 
VK_INSERT                 Insert key 
VK_DELETE                 Delete key 
VK_HELP                     Help key VK_LWIN   Left Windows key 

(Microsoft keyboard) 
VK_RWIN                    Right Windows key (Microsoft keyboard) 
VK_APPS                     Applications key (Microsoft keyboard) 
VK_NUMPAD0           0 key (numeric keypad) 
VK_NUMPAD1           1 key (numeric keypad) 
VK_NUMPAD2           2 key (numeric keypad) 
VK_NUMPAD3           3 key (numeric keypad) 
VK_NUMPAD4           4 key (numeric keypad) 
VK_NUMPAD5           5 key (numeric keypad) 
VK_NUMPAD6           6 key (numeric keypad) 
VK_NUMPAD7           7 key (numeric keypad) 
VK_NUMPAD8           8 key (numeric keypad) 
VK_NUMPAD9           9 key (numeric keypad) VK_MULTIPLY Multiply 

key (numeric keypad) 
VK_ADD                    Add key (numeric keypad) 
VK_SEPARATOR     Separator key (numeric keypad) 
VK_SUBTRACT       Subtract key (numeric keypad) 
VK_DECIMAL         Decimal key (numeric keypad) 
VK_DIVIDE            Divide key (numeric keypad) 
VK_F1             F1 key 
VK_F2             F2 key 
VK_F3             F3 key 
VK_F4             F4 key 
VK_F5             F5 key 
VK_F6             F6 key 
VK_F7             F7 key 
VK_F8             F8 key 
VK_F9             F9 key 
VK_F10             F10 key 
VK_F11             F11 key 
VK_F12             F12 key 
VK_F13             F13 key 
VK_F14             F14 key 
VK_F15             F15 key

VK_F16             F16 key 
VK_F17             F17 key 
VK_F18             F18 key 
VK_F19             F19 key 
VK_F20             F20 key 
VK_F21             F21 key 
VK_F22             F22 key 
VK_F23             F23 key 
VK_F24             F24 key 
VK_NUMLOCK             Num Lock key 
VK_SCROLL                Scroll Lock key 
VK_LSHIFT             Left Shift key (only used with GetAsyncKeyState 

and GetKeyState) 

VK_RSHIFT             Right Shift key  (only used with GetAsyncKeyStateand

 GetKeyState) 
VK_LCONTROL       Left Ctrl key  (only used with GetAsyncKeyState 

and GetKeyState) 
VK_RCONTROL      Right Ctrl key  (only used with GetAsyncKeyState 

and GetKeyState)

VK_LMENU            Left Alt key  (only used with GetAsyncKeyState 

and GetKeyState) 
VK_RMENU            Right Alt key  (only used with GetAsyncKeyState 

and GetKeyState) 
VK_PROCESSKEY       Process key 
VK_ATTN                    Attn key 
VK_CRSEL                  CrSel key 
VK_EXSEL                  ExSel key 
VK_EREOF                 Erase EOF key 
VK_PLAY                    Play key 
VK_ZOOM                  Zoom key 
VK_NONAME              Reserved for future use 
VK_PA1                      PA1 key 
VK_OEM_CLEAR         Clear key