1。 Yes

2。 The upper limit depends on the specific regulations of the exchange for each variety. You can check it on the website of the exchange.

3。 Refers to the upper limit of unilateral calculation of a single contract.

When the same customer opens positions in different futures companies, the total position of a single contract shall not exceed the position limit of the customer.

4。 Yes, the main players must open many accounts under different names for trading.

5。 A single person, who only uses one ID card to open accounts in several futures companies, cannot increase the position limit in disguise. Please see my answer to the third point for the reason.