This window displays information about one or more packages on the system. The different packages are displayed in a notebook. You can see all the normal information -- size, install date (if the package has been installed), build host, build date, distribution, vendor, group, packager and URL. If the packager entry looks like an email address, then it is turned into a clickable link that you can use to quickly send feedback to the packager. The URL information is also shown as a clickable link if it exists in the header.
Below these information fields, the longer description of the package is shown. Below this is a list of the files in the package. The first column indicates if a file is marked as documentation. The second column indicates if the file is marked as a configuration file. The third column gives one of three letters representing its state -- 'r' for replaced, 'n' for not installed or 's' for net shared.
Along the bottom of the window is a list of buttons that perform actions on the package displayed on the current page. If the package is already installed, these options will be uninstall and verify. If the package has not been installed, the options will be install, upgrade (only shown if a version of the package is already installed on the system) and check signature. There is also a close button that can be used to dismiss the window.