This command erases all the entities outside of a user specified
window. This can be useful if you somehow place entities way
outside your drawing limits and want to easily erase them.
Pick 1st corner of window to
erase outside of: Pick
point location
Pick 2nd corner:
Pick second point
location
Pulldown Menu Location: Edit > Erase
Keyboard Command: eraseout
Prerequisite: Entities to erase