Though not always he will use my IP often. Also, we have a working relationship Should I tell this to a mod? Also I want to ask question about in each other thread. Say we cooperate selling the same thing in one thread. Can I comment in case of buyer dispute, etc. Or should we really stay away from each others' thread.
First of all you need to inform any mod here with your's and your friend id. Second important thing is you both never participate in each others threads,exchange iTrader with each others,exchange Reputation with each others. Ignore anything above results in perm. ban to your both accounts. DON.
Also keep in mind that you may not start different threads to promote the same things. Only one of you should be posting ads for something (otherwise, you're essentially two accounts acting as a single account, which could contribute to duplicate account bans if there are any other issues).
Wow. What I am afraid of is mistakes I may do not deliberately. Maybe I have a thread that I forgot and he made a similar sales thread. That sort of thing. Okay, any specific mod I should talk to? Also he may sell some of my product. If customers ask question and he can't answer, can I answer it? That sort of thing? He's a newbie in seo. My understanding is no.
Does this apply only if we also share IPs? Sometimes he'll share IP, most of the time won't. I mean I have a few friends here of course that will never share IP with me. My IP is also used by many people, the way the ISP works, and I have no idea if there is any other DP member with the same IP.
Your understanding is correct. You may not answer questions in his sales thread. You may not participate in his sales threads in any way. If he isn't prepared to answer them, then either you should start the thread to deal with them or he should ask you for answers before responding there. No specific mod, just forward the info to whichever one is online at the moment. Report anyone you know who will be using your IP. If it's a shared IP, you don't need to worry about reporting those that you don't know. Chances would be slim to none that others would just happen to be promoting the same sites or doing anything else that would lead to you being banned as a duplicate.