Most webcams have a built in web server that allows you to access it remotely. I use Foscams and Ubiquity AirCams they both have remote access. If it does not, you have to open a port in your router that points to your web cam. Usually called port forwarding in the router options. That port number also has to be assigned to the camera in its firmware as well. You then access the camera via your WAN IP address and the port number: http://123.456.789.000:xx xx = the port number.
I use software from a third party called Blue Iris to access my cams.
For my weather station I access it via a webpage I created. The software include with the weather station will upload to a web page.
