I know you've said you've been looking through the help, but have you checked this? The TCP/IP must be enabled as it is not by default.
Complete the following steps to configure the VI Server.
Note If a target in a LabVIEW project supports the VI Server, you can configure the VI Server for the target using the Properties dialog box for the target. For example, use the My Computer Properties dialog box to configure the VI Server for the My Computer target.
Error 66 is "LabVIEW: The network connection was closed by the peer," as you suggest, but can be seen by improper VI server configuration settings as well.
I would start a new thread for the second question since it won't get proper attention with the title of this thread. However, see the screenshot attached to get you started. You must add the other PC at the same level as your PC, that is by right clicking on the project and not "My Computer."