eDrawings linked to SW files?

Is anyone aware if there is a way to sync an eDrawing file with SolidWorks?  We are storing an eDrawing file in a different location as the drawings and would like to have them update if possible without having to do a save as everytime.

Also, does anyone know why SolidWorks cannot make changes to an assembly or part if there is an eDrawing open on a different computer?  If the two are not tied together, why does it force SolidWorks to open as a read only?

Thanks,

Justin

SolidworksEdrawings