In PageA you would have the Page Include component, and the Unique ID of that component would be the your first argument (The target variable). That will default in with an autogenerated Id, which you can overwrite with something more readable. That makes it a bit easier to work with, but you need to be careful about making sure it is unique across the rendered page.
The second argument will be the name of the Skuid page that you want to load in (your PageB).
Note that in more recent Skuid releases, this can all be done through the action framework rather than a snippet, which I’ve been super pleased with.
