Running OpenSimLAUNCH.exe in Windows will set the OpenSim server up automatically.

As an alternative, should you encounter problems such as random crashes or the inablility to create prims you can run the opensim.exe instead of the OpenSimLAUNCH.exe.  This sometimes reduces those issues.

To allow others to connect within the same subnet, change the default.xml file in the Regions folder to:

internal_ip_address="0.0.0.0"

Max OS x: Start the server:

cd bin
mono OpenSim.exe

 Connect with the client:
Browse to where your Second Life.app file is located (by default
/Applications/Second Life.app) Right-click/control click it and select
Show Package Contents. Navigate to Contents and then Resources, and
change the arguments.txt file to:

-loginuri http://127.0.0.1:9000

or

-loginuri http://localhost:9000

or

-loginuri http://ipAddrOfYourSystem:9000