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Queries is a list of saved custom queries for easy and quick access. Once a custom query is created you don’t have to recreate it each time you want to run it. You also have the ability to share custom queries.
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Groups
Contact Groups are a way for one or more users to keep contacts organized in ways that make sense to them.
A good example of a contact group use would be for your Christmas Card List. Making a public Christmas Card List will allow all of your users choose from contacts in the database that they want to get a card for Christmas.
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Users
Users is a list of e-manage users. You can see who is logged in and send messages via a e-manage note or email. If you have the rights to log users out you can also do that from here.