Depending on the type of implementation there may be different options as to how users access the system. The most basic is that each user logs into the system with a login and password:
HotH also supports various options for Single Sign On which can be available for both onsite and hosted solutions depending on your infrastructure.
Another consideration for access to HotH systems deployed on-site, is whether the software is to be accessible by customers outside the domain. If this is a requirement then this will have an impact on how the system is installed.
Learn more about this topic by visiting the Logins page.