Certainly, Desktop can be used for some work of art, scenic panoramas... you name it!
You can place the shortcut somewhere else instead of the Desktop -> Pin to Start for instance; or put it in another folder.
You can even copy the whole path with parameters and launch it from Run or cmd window... or even place it in the startup folder and let is start when Windows starts... endless possibilities here.
This is quite easy:
From the VM window menu -> Devices -> Insert guest addition CD... then something should pop up; otherwise browse to the virtual CD in the VM and launch the installer manually from there.
For Linux guests: