Inspecting the `Right Alt` key messages using `Microsoft Spy++` returns the following:
Why does the key generate 2 messages `VK_CONTROL` and `VK_MENU`? Why is the type of `VK_CONTROL` SYS (system) while `VK_MENU` non-system?Code:WM_KEYDOWN nVirtKey:VK_CONTROL WM_KEYDOWN nVirtKey:VK_MENU WM_SYSKEYUP nVirtKey:VK_CONTROL WM_KEYUP nVirtKey:VK_MENU