This four part segment from Motorola provides a ton of information and serves as a guide on Webtop for the Droid Bionic.
Motorola Webtop is a feature of the Droid Bionic smartphone that allows you to turn your mobile device into an on-the-go netbook! If you have an HDMI cable handy, you can connect the Bionic to a monitor and surf the web using a Firefox browser while still being able to answer calls and respond to texts. You can use a WiFi connection or take advantage of the Verizon Wireless 4G connection while you browse.
Segment 1 introduces and explains what Webtop is. Segment 2 discusses accessories that are Webtop enabled. Segment 3 explains how to respond to notifications using Webtop, and segment 4 explains how to use the different applications accessible while in Webtop mode.