You can work with an unlimited amount of people simultaneously in the same competition in Athletics.app.
Preferably let everyone log in with his/her own account, you can also give different rights to different users that way. For example, they can only enter and print results. And other secretarial staff may only enter post-registrations.
You can also have everyone log in to the same account. You can log in on as many computers at once as you want.
This has been automatically translated into English
