When you select a group Hyperglance shows you a summary pane that aggregates all the entities and shows you their status.
There are 4 tabs available with the initial summary tab being the initial default. The others tabs are Group Attributes, Group Metrics and an Alarm tab. All alarms in the group are aggregated; this means any alarms the group itself has as well any alarms on any sub-nodes(etc) are all displayed here.
The group summary panel is comprised of a little stats chart per type of node contained within that group:
In the next figure you can see the donut chart for "Account" nodes.
You can also see the percentages of entities based on their current Alarms or runtime states by clicking on the button at the top of the donut list. "Alarms" is selected by default.
3. Search - both Simple and Advanced search are explained in detail here