How many sharepoint users do I need? Does Access Hosting limit concurrent users?

We count users by unique user name, but do not limit concurrent usage. This means that you can create a generic user name and password that is shared among a group of users. Most of our customers opt to create a generic user name for simple data entry and read-only groups. These customers create unique user names
for all the higher level developers, database designers, and contributors so that there is additional security and
accountability.