Cookies and subdomains

Question

Can a cookie be shared between two sites on the same top level domain? Say www.example.com and secure.example.com ? We are looking into implementin

Answer 1

Yes, but beware don't set same-named cookies in various subdomains, as the resulting cookie appears to be random; instead, set one cookie in the .maindomain.com only (not in any .sub.domain.com)