Question on Accounts and nodes

Is there any way for a smart contract to detect which node an account interacting with it is coming from?

Question rephrased:

Account A makes a transaction to an application.
Account B makes a transaction to the same application.

Is there any way for the smart contract to know which nodes Account A and B made the transactions from?

No. There is no way to track the source of the transaction, unless the originating node was placing some type of tracking unformation within the transaction itself.

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