From IBM..."IBM Navigator for i is the web-based interface for system access and management. Available on release 6.1 and later. Navigator for i combined with Access Client Solutions and Administration Runtime Expert provides all your system access and management needs. Navigator for i provides a full range of system management and performance analysis features for IBM i"

From Ross...I use the System i Navigator along with control language from command lines to perform iSeries system and file system administration and operations. Any iSeries operations or admin can be performed from a command line but often using the Navigator is more convenient.