You can perform other, non-server-related, activities while you’re getting or putting files. Background file transfer works for all of the transfer protocols supported by Dreamweaver: FTP, SFTP, LAN, WebDAV, Microsoft Visual SourceSafe, and RDS.
Non-server-related activities include common operations like typing, editing external style sheets, generating site-wide reports, and creating new sites.
Server-related activities that Dreamweaver cannot perform during file transfers include the following:
Put/Get/Check in/Check out files
Undo check-out
Create a database connection
Bind dynamic data
Preview live data
Insert a web service
Delete remote files or folders
Preview in a browser on a testing server
Save a file to a remote server
Insert an image from a remote server
Open a file from a remote server
Auto put files upon saving
Drag files to the remote site
Cut, copy, or paste files on the remote site
Refresh Remote view