baseURL="http://files.icq.net/files/get?fileId="
threads=10
cat /dev/urandom | tr -dc 'A-Z0-9' | fold -w 6 | \
while read fileID
do
   echo "$baseURL$fileID"
done | \
xargs -n1 -P $threads wget -c -t 2 -T 5 -A ".zip,.rar,.7z,.jpg,.jpeg,.bmp,.png,.gif"