I had a Solidworks guy here ask me if there is a way to open the drawing in which a part is used in from the model itself? This is obviously assuming you have the part/assembly and the drawing in your workspace. I know you can do the inverse of opening the current model that is in a drawing..the current model will automatically highlight when you select File>Open while the drawing is up.
We use Start Up Tools to perform this action. There are other Toolkit applications that do this as well, but both options only work if the drawing name is the same as the part name. I.E. 12345.prt and 12345.drw