A spotlight viewport shows the view from the spotlight, looking at its target.
Spotlight viewport controls include:
If you have more than one spotlight in the scene (and no spotlight is selected), 3D StudioMAX displays the Select Spotlight dialog for you to select the spotlight you want.
If there are more than ten cameras or spotlights listed, the last entry in the list is "More Cameras" or "More Lights." Choose this to display the Choose a View dialog, which shows the complete list.