Since "xenappweb" is not a widely recognized commercial product name on its own, this review interprets your query as referring to or the Citrix Web Client experience .

: Configuration options like sessionreliability ON allowed users to stay connected even if their network flickered.

Before the era of single sign-on, HTML5, and workspace suites, (often called the Web Interface or WI) was the primary method for delivering Citrix published applications over the web. It acted as a gateway, authenticating users and enumerating applications through a simple, browser-based portal.