First off, you'd have to make sure your coworkers had internet access at home. Similarly, you should set up a way for their office extension to reach them at home. Virtual phone systems like Gotvmail make this quite easy, where call to the office forward to a home phone, or mobile device. Also, some sort of portable storage device so you can transport your work PC data to your home PC. We have these things at my work because most of us travel on the job, so we need them.