I have not used PC Anywhere. I have used UltraVNC or Microsoft's Remote Desktop. Microsoft's Remote Desktop is built into Windows XP and Vista. If you have Vista, however, your ability to use it is specific to the version of Vista. Vista Home Basic is absolutely not going to work. And likewise, third party solutions with Vista Home Basic most likely won't work either. I found this out on my Dad's new computer when I tried to setup remote desktop and then UltraVNC to remote into his network when he needs assistance.
If you have Vista you need to find out which version you have and then see if the PCAnywhere site addresses any specific requirements or limitations.
If you have XP you can probably use the remote desktop built into the OS. But, you'll need to open up the appropriate ports on your router and/or firewall. If you're not tech. savvy then PCAnywhere is probably your solution.
Wow, I just looked at the specs of Symantec PCAnywhere....$199. UltraVNC is free but takes more knowledge to setup your network appropriately to use and you'll most likely have to setup ddns as well. But, PCAnywhere says it handles all that. How? It's not clear.
Have a look at
https://www.gotomypc.com/. It's an online service that allows the same thing for $15/month. There are other online services as well so you may want to shop. Hope this helps.
Whatever you end up using you need to make sure you have a UPS on your system to keep it up and running during short power outages (about 5 - 10 minutes without power). And you'll need to make sure your computer is setup to autostart on power failure (try rebooting your computer and pressing F2 or Del during the first 10 - 20 seconds it's booting up to enter the CMOS Setup). And you'll need to make sure the software you're using is setup to start when Windows starts. When you return you'll want to make sure you disable to the software as it is a HUGE security risk to have running when you don't specifically need it.
I used UltraVNC last year when I went to France for a week. It was really cool!