I own a current seat of Solidworks and can work on or offsite.
For offsite work, files can be exchanged either by onsite transfer to a UBS drive or directly to my laptop. I can also exchange files using DropBox, e-mail or FTP site depending upon your company's security issues.
Communication can be done via Skype, phone, e-mail or in person. I make every effort to respond quickly and can efficiently and clearly communicate issues with screenshots and text.
All drawings and models are clearly defined with a numerical rev so that changes are cleanly managed.