in the vertical marker bar to the left of the editor.Bookmarks can be used as placeholders within your scripts to allow easy navigation to pre-defined places within your scripts and resources.
Bookmarks are indicated by a bookmark icon in the vertical marker bar to the left of the editor.
Bookmarks are displayed in the Bookmarks view, which can be opened by going to Window | Show View | Bookmarks.
For more on bookmarks, see the Bookmarks topic in the Workbench User Guide.
Additional user guides can be accessed from inside PDT by going to Help | Help Contents, or from the Eclipse Online Documentation site (http://help.eclipse.org/luna/index.jsp).