* Implement basic region filtering as described in https://lists.berlios.de/pipermail/opensim-dev/2008-November/003468.html

* This is done by sending a 'major interface version' number on sim registration.  Developers must increment this every time they make a change that would make the previous 
OpenSim revision failure incompatible with the new one (non-fatal incompatibilities are fine).
* This number resides in OpenSim.Framework.Servers.VersionInfo.MajorInterfaceVersion
* This allows the grid service to stop older, incompatible regions from connecting

OpenSim/Framework/Util.cs

@@ -799,6 +799,33 @@ namespace OpenSim.Framework
             x += rx;
             y += ry;
         }
+        
+        /// <summary>
+        /// Get operating system information if available.  Returns only the first 45 characters of information
+        /// </summary>
+        /// <returns>
+        /// Operating system information.  Returns an empty string if none was available.
+        /// </returns>
+        public static string GetOperatingSystemInformation()
+        {
+            string os = String.Empty;
+
+            if (System.Environment.OSVersion.Platform != PlatformID.Unix)
+            {
+                os = System.Environment.OSVersion.ToString();
+            }
+            else
+            {
+                os = ReadEtcIssue();
+            }         
+                      
+            if (os.Length > 45)
+            {
+                os = os.Substring(0, 45);
+            }
+            
+            return os;
+        }
 
         /// <summary>
         /// Is the given string a UUID?