If you have an 80 user Web license then up to 80 simultaneous host tasks can be servicing your web site. Since these tasks only exist for the fractions of a second that most requests require, your 80 user license would likely support hundreds of users on your web site.
Webster uses a lot of HTML 5 local processing to validate and process the application UI locally. Things like resizing, changing folders, tabbing, input validation is handled locally. List box and grid sorting and column sizing along with grid row removal and changing row orders is also done locally.
It also provides a framework for web development with user management, security, layout, along with access to many Nomads components.