why to copy/paste under dos mode
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How to Copy / Paste between a command prompt, or MS-DOS program, and a Windows program?
After the copy/paste function between dos and windows is enable, execute a dos program and copy and paste as following, be sure not to execute dos program under full screen mode.

 

To Copy text under dos:

1. Click and drag the mouse pointer over the text you want.

2. Press Enter (or right-click anywhere in the window) to copy the text to the clipboard.

To Paste text into dos program:

1. Right-click anywhere in the window.

Copy and paste text under a windows program as normal.