I am using WSAD5.1.2, while starting my application on server, it was shown that "server is synchronized " message for server state. what it actually mean.
This means the server knows about all your latest project files. If it is not synchronized, your state will read "The server should be republished". If you want to know more, search for "Application Publishing" from in WSAD's Help Contents.
A good workman is known by his tools.
Don't get me started about those stupid light bulbs.