I'm not sure, what you actually mean. Do you mean, that one Reaper-instance can be synchronized by the other? So you can start playback of a video in one Reaper-instance and it will be started on the other as well?
My first shot out of my guts would be to try using MIDI, with VST: ReaControlMIDI (Cockos) in one MIDI-instance sending MIDI-messages to the other one.
But I have no clue, whether this would work at all...
Another one would be an external file, which could be set by the one and read by the other instance. If the file is set to "Go!", the other instance knows to start.
If you have multiple instances of the same Reaper-installation, you could share extstates but this would, like the external file, need programming in ReaScript.
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