Will I have access to the same trading platform or be subject to any software changes following Brexit migration?

The migration will have no impact upon the software you use to trade or administer your account. The technology will remain the same as it is today.

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Why can I log in to Client Portal but not TWS?
I received confirmation that my application has been approved but I cannot access TWS.
Do I have access to the same trading platform and/or software following the Merger?
Will the current cost basis of positions be carried over when my account is migrated due to Brexit?