Dear All Koha Users, Is it possible to operate 100 libraries centrally having data of 2million books? ==>With one installation of Koha: You can create 100 branches libraries with one shared database with 2 million books. or you can create 100 libraries with 100 different databases (but with 200 millions books- i think not good for your server...) Is it possible to issue and return books off line when internet is not available? ==> Yes, tool works in Firefox Is it possible to give user only few rights i.e. cataloging and circulation? ==> Yes, create some staff, give them few permission (for example work with circulation, cataloging, not work with system-preferences ) Is it possible to make two data bases at a time i.e one for client and one for main server in case more than 100 libraries in one system? ==> i answered before, not 2 database, but 100... or you need make one more installation in another server Can I change MARC fields for my users i.e. limited fields only ==> Not very clearly what you want, but you can change MARC fields as you want Can pre printed bar code lables be pasted on books while using Koha i.e. (I want to take a detail, let say we have a bar code # 1 i.e. pre printed and we want to add this # 1 in our koha, is this possible? ==> YOu can pre-print barcode labels and pasted on books. Then you can use a barcode scan to add it into Koha. Only one thing, it must be original. Koha accept 1 barcode for 1 item. Koha has a tools, which help you to print out barcode of books, which you imported. I would really be thankful to you for your guidance, ==>You're welcome!