When you are living in two or more grids its convenient to bring your stuff with you. With closed grid as inWorldz you cant do that without exporting and importing your stuff. But thats easy if you are the creator of all parts. The only thing is if you dont have the same textures in both grids the texture wont follow the house and you have to retexturize it. But all settings are imported with the house so its not like doing it from start again. But if it is your own textures you can import them too and name them the same. Then they might follow the house. Another option is Second inventory but thats a software and its not free.
I built this house in OsGrid and wanted to bring it to inWorldz (or vice versa). Log in with imprudence or another client that enables import/export. Start with Edit the item. Then choose Export in the File menu. Save it on your computer and name it. You will get an XML file and some blank files for the saved textures.
Log out and open the same client and log into the next grid. Go to a sandbox or another place where you can rezz. Then choose Import object in the file menu.
The object will now build itself in front of your eyes. Wait until the process is finished and then name the object. Now you only has to retexturize it if you lack of some textures in this grid. You will save energy this way when you are using grids you cant hypergrid in.
Happy exporting! =)