Passing Variables to a new page without query string

Passing Variables to a new page without query string

Is there a way to pass a variable from 1 page that has a popup iframe on
it to the popup (iframe) on client side button click without using query
strings? my variable is too big to use a query string?
Another way to ask the same question
Is there a way to pass a variable from 1 page to another page on client
side button click without using query strings? my variable is too big to
use a query string?
This is for use on IE 8 and higher html 5 storage will not work