You can set up quickbooks and store the data on one machine. You can set up different users with different permission so say the admin can only access some records but not others.
You just have to set up multi-user, add the software to the other PC. This does not require more licenses but I think you are limited.
I just set up Clip on a network as well, it integrates quickbooks.
Many people are migrating to the cloud including those mentioned above.
If you set up a network in windows and allow file sharing you can access those files on another PC in the network. I think MS Office also uses One Note in this manner so you can share and collaborate.