Convert Selection To Edge Border
This is for people who do lots of Edge Extrude - just use a lasso selection or paint selection (or whatever u like) to select some stuff around the border. Run the script. and wollaahh it has selected your outer border from the selection you did.
The Script works in ALL poly Modes (vertex - edge - polygon) - also edit poly modifier.
The image says everything
Install: place the script in 3dsmax7/UI/MacroScripts folder. Start Max. Open Customize User Interface You will find the tools in the maModellingTools Catagory.