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Want a toolbar that stays out of the way? Hover to the corner of the page to get your admin links. 
This plugin was made to enable users to get access to the admin area quickly without the default wordpress 
toolbar. The four corners of the page are configurable via drag and drop settings page.
Please let me know if you have any issues with the plugin or you would like to see additions.

Hot Corners

Replace the WordPress toolbar with configurable hot corners.

Collins Agbonghama

Simple plugin for disabling admin bar and preventing access to WordPress dashboard based on a user’s roles.
It is that simple 😀
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Admin Bar & Dashboard Access Control

I've used 2 plugins before for this stuff. This excellent little plugin makes it really easy, all in 1 plugin. Does just what it needs to and does it well.

My only complaint: it adds a new sidebar item in the Admin. It really should have it's settings under Settings or Tools sections. Only plugins with multiple pages of settings, and that need to be accessed regularly, should add more height to my sidebar. If that gets fixed, I'll change my review to 5 stars! I know it's a bit nit-picky of a complaint. I guess it shows how good this little plugin is, when that's the only thing wrong.

Works great, does the work of 2 plugins elegantly!

Disable admin bar and control users access to WordPress dashboard.

Hot Corners vs Admin Bar & Dashboard Access Control