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Case mouseButton of
 mbleft: sendkey(VK_ENTER);
 mbright: sendkey(VK_LEFT);
 ...                    

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procedure TForm1.FormMouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
case button of
mbleft: sendkeys('Up', true);

mbmiddle: sendkeys('Enter', true);

mbright: sendkeys('Down', true);

end;
end;                    

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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, SndKey32;

type                    

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SendKeys('KeyString', Wait);

Any character that can be typed is supported.  Surround the modifier keys
listed above with braces in order to send as normal text.

Supported key names (surround these with braces):


BREAK
CAPSLOCK
CLEAR
DEL
DELETE
DOWN
END
ENTER
ESC
ESCAPE

Function SendKeys(SendKeysString : PChar; Wait : Boolean) : Boolean;
type
  WBytes = array[0..pred(SizeOf(Word))] of Byte;

  TSendKey = record
    Name : ShortString;
    VKey : Byte;
  end;

const
  {Array of keys that SendKeys recognizes.

  If you add to this list, you must be sure to keep it sorted alphabetically
  by Name because a binary search routine is used to scan it.}

  MaxSendKeyRecs = 41;
  SendKeyRecs : array[1..MaxSendKeyRecs] of TSendKey =
  (
   (Name:'BACKSPACE';       VKey:VK_BACK),
   (Name:'BKSP';            VKey:VK_BACK),
   (Name:'BREAK';           VKey:VK_CANCEL),
   (Name:'BS';              VKey:VK_BACK),
   (Name:'CAPSLOCK';        VKey:VK_CAPITAL),
   (Name:'CLEAR';           VKey:VK_CLEAR),
   (Name:'DEL';             VKey:VK_DELETE),
   (Name:'DELETE';          VKey:VK_DELETE),
   (Name:'DOWN';            VKey:VK_DOWN),
   (Name:'END';             VKey:VK_END),
   (Name:'ENTER';           VKey:VK_RETURN),
   (Name:'ESC';             VKey:VK_ESCAPE),
   (Name:'ESCAPE';          VKey:VK_ESCAPE),
   (Name:'F1';              VKey:VK_F1),
   (Name:'F10';             VKey:VK_F10),
   (Name:'F11';             VKey:VK_F11),
   (Name:'F12';             VKey:VK_F12),
   (Name:'F13';             VKey:VK_F13),
   (Name:'F14';             VKey:VK_F14),
   (Name:'F15';             VKey:VK_F15),
   (Name:'F16';             VKey:VK_F16),
   (Name:'F2';              VKey:VK_F2),
   (Name:'F3';              VKey:VK_F3),
   (Name:'F4';              VKey:VK_F4),
   (Name:'F5';              VKey:VK_F5),
   (Name:'F6';              VKey:VK_F6),
   (Name:'F7';              VKey:VK_F7),
   (Name:'F8';              VKey:VK_F8),
   (Name:'F9';              VKey:VK_F9),
   (Name:'HELP';            VKey:VK_HELP),
   (Name:'HOME';            VKey:VK_HOME),
   (Name:'INS';             VKey:VK_INSERT),
   (Name:'LEFT';            VKey:VK_LEFT),
   (Name:'NUMLOCK';         VKey:VK_NUMLOCK),
   (Name:'PGDN';            VKey:VK_NEXT),
   (Name:'PGUP';            VKey:VK_PRIOR),
   (Name:'PRTSC';           VKey:VK_PRINT),
   (Name:'RIGHT';           VKey:VK_RIGHT),
   (Name:'SCROLLLOCK';      VKey:VK_SCROLL),
   (Name:'TAB';             VKey:VK_TAB),
   (Name:'UP';              VKey:VK_UP)
  );                    

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procedure TForm1.SendUp;
var
  KeyInputs: array of TInput;
  KeyInputCount: Integer;

  procedure KeybdInput(VKey: Byte; Flags: DWORD);
  begin
    Inc(KeyInputCount);
    SetLength(KeyInputs, KeyInputCount);
    KeyInputs[KeyInputCount - 1].Itype := INPUT_KEYBOARD;
    with  KeyInputs[KeyInputCount - 1].ki do
    begin
      wVk := VKey;
      wScan := MapVirtualKey(wVk, 0);
      dwFlags := KEYEVENTF_EXTENDEDKEY;
      dwFlags := Flags or dwFlags;
      time := 0;
      dwExtraInfo := 0;
    end;
  end;
begin
  KeybdInput(VK_Return, 0);                // Alt
  KeybdInput(VK_Return, KEYEVENTF_KEYUP); // Alt
  SendInput(KeyInputCount, KeyInputs[0], SizeOf(KeyInputs[0]));
end;