a "netsync" module is alread available. You have to setup the stream server to act as a "sync reference" (or whatever its supposed to be called) and ask all the clients to use it to sync.
You have no idea how good it feels to hear that there's a solution after a whole day of struggling with this!!
So a biiig biiig thank you!
Although I'm still struggling with it. I thought I fixed all the settings properly, but it's not synched yet.
I did this on the server computer: I went to Settings/Preferences/Interface/Control Interfaces and then checked the box for Network Synchronisation. After that I checked the box in its Advanced Settings "Act as master for network synchronisation". Then I saved the properties and went to check the settings for the receiving computer.
For the client machine I checked the box for Network Synchronisation and added the ip address of the server machine to the box "Master Client IP Address".
After that I just started streaming from the server (with "Play Locally" checked) and opened the stream from the other computer. They still weren't synced though.
Is there something obvious I have missed?