This chapter discusses audible and visual cues that enable
the user to navigate in your interface. The user requires information
from your interface to interpret interface interactions and responses.
You can provide cues to assist the user.
The user also requires information when an event or situation
occurs that prevents, or has the potential to prevent, the user's
action from being completed as expected. Such situations are called
exceptions. Exceptions occur when your application
is unable to interpret a user's action.
A typical method for notifying the user about an exception is to
use cues.
The user can also request information from the system by activating
help messages, which are a type of cue.
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