25 July 2010
Linkage is the process of defining shared properties for an asset in a source document in order to make the asset accessible for linking to destination documents. Use the Symbol Properties dialog box or the Linkage Properties dialog box in the Adobe Flash Professional Library to define assets shared at runtime.
In the Options menu of the Library panel (while an asset is selected), select Properties. In the Properties window, click the Advanced button to see the linkage fields. Select the desired font symbol, sound, or bitmap graphic to set as linked from within the Flash project.
To access the asset via ActionScript at runtime, click the check box next to Export for Runtime Sharing. If an object is not present on the Stage at the time the SWF is published, the assets in the Library will not be exported and therefore will not be accessible to ActionScript at runtime if this option is not selected.
You can link to a shared asset by entering its URL. You can also drag the asset into the destination document in the Flash authoring environment (see the external library glossary entry).
To learn more about linkage, see Sharing library assets in the Flash documentation.