Also see Kana's SendKey executable. Site
You'll see LWIN or RWIN even allows you to choose the left or right WinKey. It's pretty versatile when scripting... and as a bonus it doesn't require installation.
Here's the readme contents:
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DESCRIPTION:
Kana SendKey is a command line program which can be used
to send a system wide hotkey.
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HOW TO USE:
1. Run it with several parameters attached into the
command line. For information about the parameters,
see the Parameter section below.
2. You can also create a shortcut and assign the parameters
on shortcut.
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SYNTAX:
KanaKey [parameter1] [parameter2] ...
Example:
To send system wide CTRL+ALT+O, use:
KanaKey CTRL ALT O
Note: If no parameter is given, no action is performed.
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PARAMETERS:
CTRLBREAK = Control+Break
BACKSPACE = Backspace key
TAB = Tab key
CLEAR = Clear key
RETURN = Enter key
SHIFT = Shift key
CTRL = Ctrl Key
ALT = Alt key
PAUSE = Pause key
CAPS = Caps Lock key
ESC = Esc key
SPACE = Space key
PAGEUP = Page Up key
PAGEDOWN = Page Dn key
END = End key
HOME = Home key
LEFT = Left Arrow key
UPARROW = Up Arrow key
RIGHTARROW = Right Arrow key
DOWNARROW = Down Arrow key
PRINTSCR = Prnt Scrn key
INSERT = Insert Key
DEL = Delete Key
LWIN = Left Win key
RWIN = Right Win key
NUM0 = Numeric 0 key
NUM1 = Numeric 1 key
NUM2 = Numeric 2 key
NUM3 = Numeric 3 key
NUM4 = Numeric 4 key
NUM5 = Numeric 5 key
NUM6 = Numeric 6 key
NUM7 = Numeric 7 key
NUM8 = Numeric 8 key
NUM9 = Numeric 9 key
MULTIPLY = * key on numeric key pad
ADD = + key on numeric key pad
SUBTRACT = - key on numeric key pad
DECIMAL = . key on numeric key pad
DIVIDE = / key on numeric key pad
F1 = F1 key
F2 = F2 key
F3 = F3 key
F4 = F4 key
F5 = F5 key
F6 = F6 key
F7 = F7 key
F8 = F8 key
F9 = F9 key
F10 = F10 key
F11 = F11 key
F12 = F12 key
F13 = F13 key
F14 = F14 key
F15 = F15 key
F16 = F16 key
F17 = F17 key
F18 = F18 key
F19 = F19 key
F20 = F20 key
F21 = F21 key
F22 = F22 key
F23 = F23 key
F24 = F24 key
NUMLOCK = Num Lock key
SCROLLLOCK = Scroll Lock key