Do I have to install travel agency software on my office computers, or does it work in a web browser?

No, in most cases you do not have to install anything on your office computers. Modern travel agency software runs in a web browser, so you open your web address, sign in with your own username and password, and start working. The same login works on a laptop at home, on a machine in a branch office, or on a computer you borrow while you are travelling.

That way of working suits a small team. Nobody has to be paid to set up every new machine, and when the system is improved everyone gets the change at the same time without anyone downloading an update. It also means you need a steady internet connection, because if the connection drops you will not be able to search or book until it comes back.

There are a few exceptions worth being honest about. Some agencies still need a small helper program on one machine for jobs like printing tickets on special stationery, running a card machine, or reaching an older booking terminal given to you by an airline or a consolidator. Whether any of that applies to you depends on your suppliers and on the plan you are on, not on the software by itself.

Before you commit, ask whether the system is fully browser based, which browsers it has been tested on, and what happens to work in progress if your internet goes down for a few minutes. It is also worth trying it on your own phone or tablet, since that is often where you will need it most when you are away from the desk.