You are trying to use programs called "VCN programs." These are programs that allow you to remote into a PC on other networks with the correct permissions. I prefer to use Team Viewer.
However here is a list of some programs you might want to try:
KEEP IN MIND.. that you need to have the computer on EACH end on in order to access it, so if your leaving for the road, make sure to leave your computer on.
I hope this helps!