How do I set a window to always on top?

I need to make the active window always on top. How can I do this with AutoHotkey v2?

Hotkey is CTRL + SPACE:

^space::
{
    WinSetAlwaysOnTop -1, "A"
}

Not all parameters are mandatory. -1 toggles the setting (e.g. OFF becomes ON) and "A" tells it to use the active window (whichever has focus). You can also pass it the name of a window, like "Calculator".

Documentation:

• WinSetAlwaysOnTop
• WinTitle