How can I share my screen from Android device to another Android device? I hand my clients an Xoom (Android tablet) and I am holding a Xoom.

How do I simply have them watch what I'm doing on my screen? No video, audio, or anything else fancy needed. All I need is a simple screen share. Will be showing documents, webpages, and such.

Join.me and GoToMeeting only allow view mode, not share mode on Android. There has to be a program to allow this.
Try this app. It allows you to share the screens between two tablets or two mobile devices of varying dimensions wirelessly and does not require any thing extra as per your requirements.