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Why Tally Connector is required in Tally.Developer 9?
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https://help.tallysolutions.com/docs/td9rel54/faq/6107.html

Use of Tally Connector in Tally.Developer 9

Tally Connector allows sending the XML request to Tally/any application and displays the response received in the response window. This will help you to validate the XML request structured by you is valid or not