The Build Icon Window lists the files generated for the active Help target as well as any Help compiler errors or unresolved links that occurred during the previous build.
Select Errors or Unresolved Links in the left pane, and then double-click the error or unresolved link in the right pane to open the View Message dialog box, which lists the error message or unresolved link.
Click the Open Document button to open the source document at the location of the topic containing the broken link or error.
Debug output from scripts is also displayed within this window. Select Script Output in the left pane.