Enabled contracts

#1
Is it possible that enabled contracts for icicidirect will be different from enabled contracts in kotak securities or for that matter any 2 brokering houses? I read something on this and want to know which is the best brokerage house with maximum enabled contracts.

Thanks for the comments.
 
#2
Sorry I am an NRI, how about I give you my email address so we can talk outside?

Also one more query, can I buy and sell same futures contract and settle on different dates?
 

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