of the page, we still wouldn't know which links had been followed by the
user. This is a general problem for PBE systems in interfacing to almost all
applications. Procedures that seem easy for a user to carry out manually us-
ing the operations of the user interface are not always easy for an external
agent program to carry out by using the application's API.
This example shows the conceptual gap between a user's view of an ap-
plication and its underlying programmable functionality. Bridging this gap
can be extremely difficulty for a PBE system~its representation
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