Constants

VK_LBUTTON  (0x01)

Left mouse button

VK_RBUTTON  (0x02)

Right mouse button

VK_CANCEL  (0x03)

Control-break processing

VK_MBUTTON  (0x04)

Middle mouse button (three-button mouse)

VK_XBUTTON1  (0x05)

Windows 2000/XP: X1 mouse button

VK_XBUTTON2  (0x06)

Windows 2000/XP: X2 mouse button

-  (0x07)

Undefined

VK_BACK  (0x08)

BACKSPACE key

VK_TAB  (0x09)

TAB key

-  (0x0A-0B)

Reserved

VK_CLEAR  (0x0C)

CLEAR key

VK_RETURN  (0x0D)

ENTER key

-  (0x0E-0F)

Undefined

VK_SHIFT  (0x10)

SHIFT key

VK_CONTROL  (0x11)

CTRL key

VK_MENU  (0x12)

ALT key

VK_PAUSE  (0x13)

PAUSE key

VK_CAPITAL  (0x14)

CAPS LOCK key

VK_KANA  (0x15)

Input Method Editor (IME) Kana mode

VK_HANGUEL  (0x15)

IME Hanguel mode (maintained for compatibility; use VK_HANGUL)

VK_HANGUL  (0x15)

IME Hangul mode

-  (0x16)

Undefined

VK_JUNJA  (0x17)

IME Junja mode

VK_FINAL  (0x18)

IME final mode

VK_HANJA  (0x19)

IME Hanja mode

VK_KANJI  (0x19)

IME Kanji mode

-  (0x1A)

Undefined

VK_ESCAPE  (0x1B)

ESC key

VK_CONVERT  (0x1C)

IME convert

VK_NONCONVERT  (0x1D)

IME nonconvert

VK_ACCEPT  (0x1E)

IME accept

VK_MODECHANGE  (0x1F)

IME mode change request

VK_SPACE  (0x20)

SPACEBAR

VK_PRIOR  (0x21)

PAGE UP key

VK_NEXT  (0x22)

PAGE DOWN key

VK_END  (0x23)

END key

VK_HOME  (0x24)

HOME key

VK_LEFT  (0x25)

LEFT ARROW key

VK_UP  (0x26)

UP ARROW key

VK_RIGHT  (0x27)

RIGHT ARROW key

VK_DOWN  (0x28)

DOWN ARROW key

VK_SELECT  (0x29)

SELECT key

VK_PRINT  (0x2A)

PRINT key

VK_EXECUTE  (0x2B)

EXECUTE key

VK_SNAPSHOT  (0x2C)

PRINT SCREEN key

VK_INSERT  (0x2D)

INS key

VK_DELETE  (0x2E)

DEL key

VK_HELP  (0x2F)

HELP key

 (0x30)

0 key

 (0x31)

1 key

 (0x32)

2 key

 (0x33)

3 key

 (0x34)

4 key

 (0x35)

5 key

 (0x36)

6 key

 (0x37)

7 key

 (0x38)

8 key

 (0x39)

9 key

-  (0x3A-40)

Undefined

 (0x41)

A key

 (0x42)

B key

 (0x43)

C key

 (0x44)

D key

 (0x45)

E key

 (0x46)

F key

 (0x47)

G key

 (0x48)

H key

 (0x49)

I key

 (0x4A)

J key

 (0x4B)

K key

 (0x4C)

L key

 (0x4D)

M key

 (0x4E)

N key

 (0x4F)

O key

 (0x50)

P key

 (0x51)

Q key

 (0x52)

R key

 (0x53)

S key

 (0x54)

T key

 (0x55)

U key

 (0x56)

V key

 (0x57)

W key

 (0x58)

X key

 (0x59)

Y key

 (0x5A)

Z key

VK_LWIN  (0x5B)

Left Windows key (Microsoft Natural keyboard)

VK_RWIN  (0x5C)

Right Windows key (Natural keyboard)

VK_APPS  (0x5D)

Applications key (Natural keyboard)

-  (0x5E)

Reserved

VK_SLEEP  (0x5F)

Computer Sleep key

VK_NUMPAD0  (0x60)

Numeric keypad 0 key

VK_NUMPAD1  (0x61)

Numeric keypad 1 key

VK_NUMPAD2  (0x62)

Numeric keypad 2 key

VK_NUMPAD3  (0x63)

Numeric keypad 3 key

VK_NUMPAD4  (0x64)

Numeric keypad 4 key

VK_NUMPAD5  (0x65)

Numeric keypad 5 key

VK_NUMPAD6  (0x66)

Numeric keypad 6 key

VK_NUMPAD7  (0x67)

Numeric keypad 7 key

VK_NUMPAD8  (0x68)

Numeric keypad 8 key

VK_NUMPAD9  (0x69)

Numeric keypad 9 key

VK_MULTIPLY  (0x6A)

Multiply key

VK_ADD  (0x6B)

Add key

VK_SEPARATOR  (0x6C)

Separator key

VK_SUBTRACT  (0x6D)

Subtract key

VK_DECIMAL  (0x6E)

Decimal key

VK_DIVIDE  (0x6F)

Divide key

VK_F1  (0x70)

F1 key

VK_F2  (0x71)

F2 key

VK_F3  (0x72)

F3 key

VK_F4  (0x73)

F4 key

VK_F5  (0x74)

F5 key

VK_F6  (0x75)

F6 key

VK_F7  (0x76)

F7 key

VK_F8  (0x77)

F8 key

VK_F9  (0x78)

F9 key

VK_F10  (0x79)

F10 key

VK_F11  (0x7A)

F11 key

VK_F12  (0x7B)

F12 key

VK_F13  (0x7C)

F13 key

VK_F14  (0x7D)

F14 key

VK_F15  (0x7E)

F15 key

VK_F16  (0x7F)

F16 key

VK_F17  (0x80H)

F17 key

VK_F18  (0x81H)

F18 key

VK_F19  (0x82H)

F19 key

VK_F20  (0x83H)

F20 key

VK_F21  (0x84H)

F21 key

VK_F22  (0x85H)

F22 key

VK_F23  (0x86H)

F23 key

VK_F24  (0x87H)

F24 key

-  (0x88-8F)

Unassigned

VK_NUMLOCK  (0x90)

NUM LOCK key

VK_SCROLL  (0x91)

SCROLL LOCK key

 (0x92-96)

OEM specific

-  (0x97-9F)

Unassigned

VK_LSHIFT  (0xA0)

Left SHIFT key

VK_RSHIFT  (0xA1)

Right SHIFT key

VK_LCONTROL  (0xA2)

Left CONTROL key

VK_RCONTROL  (0xA3)

Right CONTROL key

VK_LMENU  (0xA4)

Left MENU key

VK_RMENU  (0xA5)

Right MENU key

VK_BROWSER_BACK  (0xA6)

Windows 2000/XP: Browser Back key

VK_BROWSER_FORWARD  (0xA7)

Windows 2000/XP: Browser Forward key

VK_BROWSER_REFRESH  (0xA8)

Windows 2000/XP: Browser Refresh key

VK_BROWSER_STOP  (0xA9)

Windows 2000/XP: Browser Stop key

VK_BROWSER_SEARCH  (0xAA)

Windows 2000/XP: Browser Search key

VK_BROWSER_FAVORITES  (0xAB)

Windows 2000/XP: Browser Favorites key

VK_BROWSER_HOME  (0xAC)

Windows 2000/XP: Browser Start and Home key

VK_VOLUME_MUTE  (0xAD)

Windows 2000/XP: Volume Mute key

VK_VOLUME_DOWN  (0xAE)

Windows 2000/XP: Volume Down key

VK_VOLUME_UP  (0xAF)

Windows 2000/XP: Volume Up key

VK_MEDIA_NEXT_TRACK  (0xB0)

Windows 2000/XP: Next Track key

VK_MEDIA_PREV_TRACK  (0xB1)

Windows 2000/XP: Previous Track key

VK_MEDIA_STOP  (0xB2)

Windows 2000/XP: Stop Media key

VK_MEDIA_PLAY_PAUSE  (0xB3)

Windows 2000/XP: Play/Pause Media key

VK_LAUNCH_MAIL  (0xB4)

Windows 2000/XP: Start Mail key

VK_LAUNCH_MEDIA_SELECT  (0xB5)

Windows 2000/XP: Select Media key

VK_LAUNCH_APP1  (0xB6)

Windows 2000/XP: Start Application 1 key

VK_LAUNCH_APP2  (0xB7)

Windows 2000/XP: Start Application 2 key

-  (0xB8-B9)

Reserved

VK_OEM_1  (0xBA)

Used for miscellaneous characters; it can vary by keyboard.

Windows 2000/XP: For the US standard keyboard, the ';:' key

VK_OEM_PLUS  (0xBB)

Windows 2000/XP: For any country/region, the '+' key

VK_OEM_COMMA  (0xBC)

Windows 2000/XP: For any country/region, the ',' key

VK_OEM_MINUS  (0xBD)

Windows 2000/XP: For any country/region, the '-' key

VK_OEM_PERIOD  (0xBE)

Windows 2000/XP: For any country/region, the '.' key

VK_OEM_2  (0xBF)

Used for miscellaneous characters; it can vary by keyboard.

Windows 2000/XP: For the US standard keyboard, the '/?' key

VK_OEM_3  (0xC0)

Used for miscellaneous characters; it can vary by keyboard.

Windows 2000/XP: For the US standard keyboard, the '`~' key

-  (0xC1-D7)

Reserved

-  (0xD8-DA)

Unassigned

VK_OEM_4  (0xDB)

Used for miscellaneous characters; it can vary by keyboard.

Windows 2000/XP: For the US standard keyboard, the '[{' key

VK_OEM_5  (0xDC)

Used for miscellaneous characters; it can vary by keyboard.

Windows 2000/XP: For the US standard keyboard, the '\|' key

VK_OEM_6  (0xDD)

Used for miscellaneous characters; it can vary by keyboard.

Windows 2000/XP: For the US standard keyboard, the ']}' key

VK_OEM_7  (0xDE)

Used for miscellaneous characters; it can vary by keyboard.

Windows 2000/XP: For the US standard keyboard, the 'single-quote/double-quote' key

VK_OEM_8  (0xDF)

Used for miscellaneous characters; it can vary by keyboard.

-  (0xE0)

Reserved

 (0xE1)

OEM specific

VK_OEM_102  (0xE2)

Windows 2000/XP: Either the angle bracket key or the backslash key on the RT 102-key keyboard

 (0xE3-E4)

OEM specific

VK_PROCESSKEY  (0xE5)

Windows 95/98/Me, Windows NT 4.0, Windows 2000/XP: IME PROCESS key

 (0xE6)

OEM specific

VK_PACKET  (0xE7)

Windows 2000/XP: Used to pass Unicode characters as if they were keystrokes. The VK_PACKET key is the low word of a 32-bit Virtual Key value used for non-keyboard input methods. For more information, see Remark in KEYBDINPUT, SendInput, WM_KEYDOWN, and WM_KEYUP

-  (0xE8)

Unassigned

 (0xE9-F5)

OEM specific

VK_ATTN  (0xF6)

Attn key

VK_CRSEL  (0xF7)

CrSel key

VK_EXSEL  (0xF8)

ExSel key

VK_EREOF  (0xF9)

Erase EOF key

VK_PLAY  (0xFA)

Play key

VK_ZOOM  (0xFB)

Zoom key

VK_NONAME  (0xFC)

Reserved

VK_PA1  (0xFD)

PA1 key

VK_OEM_CLEAR  (0xFE)

Clear key

至于具体十六进制数代表什么功能，我在MSDN找到了答案。
（http://msdn.microsoft.com/en-us/library/ms645540(VS.85).aspx）

下面摘录一段：

VK_BROWSER_BACK (0xA6)
Windows 2000/XP: Browser Back key

VK_BROWSER_FORWARD (0xA7)
Windows 2000/XP: Browser Forward key

VK_BROWSER_REFRESH (0xA8)
Windows 2000/XP: Browser Refresh key

VK_BROWSER_STOP (0xA9)
Windows 2000/XP: Browser Stop key

VK_BROWSER_SEARCH (0xAA)
Windows 2000/XP: Browser Search key

VK_BROWSER_FAVORITES (0xAB)
Windows 2000/XP: Browser Favorites key

VK_BROWSER_HOME (0xAC)
Windows 2000/XP: Browser Start and Home key

VK_VOLUME_MUTE (0xAD)
Windows 2000/XP: Volume Mute key

VK_VOLUME_DOWN (0xAE)
Windows 2000/XP: Volume Down key

VK_VOLUME_UP (0xAF)
Windows 2000/XP: Volume Up key

VK_MEDIA_NEXT_TRACK (0xB0)
Windows 2000/XP: Next Track key

VK_MEDIA_PREV_TRACK (0xB1)
Windows 2000/XP: Previous Track key

VK_MEDIA_STOP (0xB2)
Windows 2000/XP: Stop Media key

VK_MEDIA_PLAY_PAUSE (0xB3)
Windows 2000/XP: Play/Pause Media key

VK_LAUNCH_MAIL (0xB4)
Windows 2000/XP: Start Mail key

VK_LAUNCH_MEDIA_SELECT (0xB5)
Windows 2000/XP: Select Media key

VK_LAUNCH_APP1 (0xB6)
Windows 2000/XP: Start Application 1 key

VK_LAUNCH_APP2 (0xB7)
Windows 2000/XP: Start Application 2 key

B6 Application 1 就是我的电脑
B7 Application 2 就是计算器

为了更方便的实现这些功能，我编了一段简单的vbs

简单的解释一下
a=chr(h88b5)
'“h”表示后面的数是十六进制数，b5代表Media key，也就是媒体播放器（比如千千静听），为什么前面要加88呢？加了88以后，有两个字节，也就构成了一个汉字（是GBK里的），因为a代表的字符若不是真正有意义的字符（比如ASCII字符和汉字），sendkeys就不会起作用，大家可以试一下。至于为什么选择88，因为在msdn里写着(0x88-8F)Unassigned，同时88为开头的字符可以组成有意义的GBK汉字。