Not much to explain, just follow the steps and see the amazing matrix effect happen in your DOS window:
color 02
:start
echo %random% %random% %random% %random% %random% %random% %random% %random% %random% %random%
goto start
color 02
:start
echo %random% %random% %random% %random% %random% %random% %random% %random% %random% %random%
goto start