|You can do a garden variety SET to a very long string of nums.|
As R2 says, an ARITHMRTIC SET has a limit.
BUT [Here comes the but part.] a for /L will treat it as a number.
:: bigset.bat Wed 16-03-2011 2:33:27.66
@echo off & setLocal enableDELAYedeXpansioN
for /L %%a in (!z!,1,429496733) do (
Life is too important to be taken seriously.