The pressing ALT+ Space bar brings up a menu from the upper left cornor ICON

Now you can cursor down to edit and select MARK

and holding the shift key, work the cursor keys to add to the covered area.

Until you cover all the area you need. Hit ENTER, and now you can paste the text into any Document DOS or Windows.
You can also press the dashed box icon and use your mouse to drag the covered area to get the same effect.