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"Use Edit Log for transactions/masters, and digital signature for invoices/reports with Release 2.1. Download NOW!"
https://help.tallysolutions.com/docs/ts9rel54/faq/7786_h.htm

How many Clients can I connect to Tally.Server 9?

You can connect 100 – 150 users to Tally.Server 9.

With Tally.Server 9, there is essentially no blocking of another user’s tasks, even as new users continue to get added to the system, or because of the types of tasks that are being performed. However, there will be an effect on performance if you add too many users.