PHPSESSIONS conflicts with Varnish

Is there any way you can change your plugin to not use PHPSESSIONS?

I see you’ve commented out a lot of session_start calls, but it still sets a session cookie so Varnish doesn’t cache.

I think this is just in your captcha and turning it off would work, but it’s someone else’s site and I can’t be 100% sure. It’d be great if you didn’t use ’em though 😀

http://ww.wp.xz.cn/plugins/pie-register/