Display By Category
This script was requested by titane357 here: click
It will display objects based on their class. For example if the spline object is selected the script will hide all other objects and only the spline objects will remain visible in the viewports. If the light object is selected only the light objects will remain visible.
Installation: drag and drop the mcr file in max viewports. Go to Customize - Customize User Interface - "miauu" category and search for "Display By Category" script.