How to delete offboards objects on protel?

Demonstrated on  Protel 99 SE SP2 

1. Go to view > select > outside area ( shortcut key e > s > o )
2. Select the area on design which you would like to keep.
3. Now you see, all the objects outside the area are selected.
4. Now, press CTRL & DELETE key together
5. All the outside objects are now deleted ( will take little time, depends on how much objects you are deleting)

If I make you happy please comment. 

Watch it on youtube [ comming soon ]