I use Windows "Briefcases" to keep a second PC and a laptop sync'd with the main PC.
Create a new Briefcase in your "client" PC and drag the folders you want to keep sync'd from the "host" PC over the network into the Briefcase. (I found this to be more reliable than copying the files into a Briefcase in the "host" and then dragging the Briefcase itself across.)
You can then work in the "client" PC directly from the copies in the Briefcase. As long as you don't amend the *same* file in *both* PCs between synchronisations, it should work OK.
I would recommend putting *folders* into the Briefcase rather than just files so that, in the "client" PC, you can add a file to the folder and the *folder* will sync with the "host" and update it. A new file added directly to the Briefcase in the "client" PC won't sync with the "host", but if in a sync'd folder it will.