http://help.autodesk.com/view/3DSMAX/2016/ENU//?guid=GUID-3D743E3A-B01D-4C3F-9E16-CD1D3BAF7F2A
What is the name of that yellow outline around the objects?
Scroll down the help page linked above almost to the bottom - they are explained there.
A Yellow outline is a Preview of the object which would be selected if you clicked. Those with a Blue outline are already selected.