The package creates three environments:
– framed, which puts an ordinary frame box around the region,
– shaded, which shades the region, and
– leftbar, which places a line at the left side.
The environments allow a break at their start (the \FrameCommand enables creation of a title that is “attached” to the environment); breaks are also allowed in the course of the framed/shaded matter.

There is also a command \MakeFramed to make your own framed-style environments.

The author is Donald Arseneau. The package is Copyright © 1992-2007 Donald Arseneau.