This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Two cookies != two sessions: you'll still be in the same HTTP session.
Setting cookies isn't particularly Struts-specific; I don't recall what support, if any, S1 has for cookie handling. S2 has a CookieAware interceptor (or something like that) that'll put a map of cookies into an action.
I'm not sure that it's going to do what you think it's going to do, though.