You could assign each diggera number, then use this script to get a random number...
@echo off
set num=10
:loop
set rnd=%random%
set /a rnd+=%random%
set /a rnd=%rnd% / 1000
if %rnd% GTR %num% goto loop
echo And the winner is...
ping localhost -n 2 > nul
echo Contestand number %rnd%!!!
pause