When using Webform Server, users do not need to install any client-side software. Instead, they can rely on their standard Web browser for viewing and filling out forms. However, this also limits the functionality available to users, since some functionality cannot be provided without client software.
In many cases, these differences in functionality require a different approach to form design. For instance, forms designed for use with the Viewer may include sliders and computes that rely on the keypress or mouse-over events. However, since neither of these features is supported by Webform Server, these forms would not work in a Webform Server environment.
As a general rule, any form that works with Webform Server will also work with the Viewer, but the reverse is not true. If you are designing forms for an environment that uses both Webform Server and the Viewer, be sure to restrict the functionality of the forms to those features that Webform Server supports.
You do not need to be familiar with these differences to install and run Webform Server, but you should review these differences if you are designing forms for use with Webform Server.
Parent topic: Webform Server technical overview