User Interface
Hopper has an easy-to-use user interface, on the left, there's a list of registered databases to which you can connect and browse routines. On the right, the routine being debugged and additionally opened routines (for "trace into" debugging).
Near the bottom are several other debug windows, including a list of breakpoints set in several routines and the call stack.
An example debugging session
For detailed information, see Debugger Overview.
Making databases available for use with Hopper
Before you are able to debug a routine in your database, you need to register a database with Hopper. This configuration is then saved and you can connect to the database easily next time you use Hopper.