Only correlation is its the same company!! other than that, nada...dont try read the two markets as a single company and draw conclusions. I tried for a long time and found out the two listings operate under vastly different market conditions. Choose which one you are tracking/investing/trading and stick to it.
Check it out during our time 16h00 to 17h00 when SOL and SSL is trading simultaneously. You can see an active page for SSL on http://finance.yahoo.com/q?s=SSL which you can run alongside OST. Depends however on the daylight savings cycle which which is not favourable right now.