I see a new link feature in IB Account Management. I want to create 4 linked accounts - is it possible to create: 1 Joint futures margin account. 2 Joint cash options trading account - long options and cash secured option sales (if possible). 3 Joint cash investing account. 4 Joint cash investing account (with different person than above three). So my questions: 1 Does IB even allow cash accounts or is every account automatically a margin account? 2 Are cash secured option sales or covered sales allowed in a cash account? 3 If I can link all four accounts then do I manage them all like an advisor account?