UBB.threads PHP Forum Software Community Forums Resources and Customizing How Do I? Cookie path and multiple subdomains

I'm in the process of buying a copy of PhotoPost to put onto images.haroldandrews.com . I have my version 7 board at forum.haroldandrews.com . The support forum at PhotoPost let me know that I can integrate the two if they both use the same cookie domain.

Do I need to set the cookie domain on the Photopost install to something like "forum.haroldandews.com" to work with the the boards default cookie path setting of "/" in the Control Panel Primary Settings?

Thanks.