Problems View

The Force.com IDE leverages the standard Eclipse view called Problems to display compilation
errors.When you save changes to an object in a Force.com Project, it is sent over
the network to the Force.com service for compilation. If compilation fails, Force.comspecific
errors are added to the Problems view. In most cases, you can double-click a problem
row to navigate to the offending line of code.

Schema Explorer

The Schema Explorer allows direct interaction with the Force.com database. Use it to
inspect objects and fields and to execute database queries and preview their results.To
open the Schema Explorer, double-click the object named salesforce.schema in any
Force.com Project