i want to develop 1 application its just like hotel managment type, but i want to connect with tally for releted entries.

so please suggest me from where to start.

Well you need to do the following:

1) Sit down and figure out what data needs to be stored ( You WILL need a database )
2) Choose the database that's right for you.
3) Design your atomic tables (1NF,2NF,3NF)
4) Desing your GUI (With the end user in mind)
5) Develop a flowchart for your application
6) Write the code.

And if by Tally you mean the accounting software - you will want to ask integration questions on their development forum.

No problem friend. =)

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