If this button is enabled on your system it provides a list of the Collections available to you for searching.
From here, if you click the Collection link, this opens a new window that allows you to search using the native interface of another database, e.g. EBSCO. You can carry out searches in this interface while still maintaining your ZPORTAL session.
If you click the info icon this gives you details about the collection. If the Collection URL is enabled you can Click to search the database. This too allows you to search using the native interface.
The number of Collections shown differs according to how it is implemented on your system. It may include:
all databases available to you OR
only databases selected for the current search.