Using an integrated HTML editor
When you install Dreamweaver, you can install HomeSite in Windows or a trial version of BBEdit on the Macintosh. Dreamweaver is tightly integrated with both of these products.
Because of this integration, you can edit a document in both Dreamweaver and HomeSite/BBEdit, switching from one application to the other, and the document is kept in sync automatically in both applications. In addition, both applications track the current selection; for example, if you select text in Dreamweaver and switch to BBEdit, the same element is selected in BBEdit.
You can open other external editors (besides HomeSite or BBEdit) from Dreamweaver, but the document is not kept in sync in both applications as it is with HomeSite or BBEdit. When you are finished making changes in an external editor other than HomeSite or BBEdit, you must manually refresh the document in Dreamweaver.