You can only work on one standalone site, or theme, at a time but you can have as many themes installed as you want. If you want to work on more than 1 site, you'll need to install a second copy of WordPress.
not understanding. I can have as many themes to a wordpress site installed as I want? with content? URL1 can have six themes?
But, I digress.
How do I use WordPress 3.0.1 to build URL 2 and URL 3 while maintaining URL1.
Do I need to download WordPress 3.0.1 for both URL2 and URL 3 separately?
IF not, now do I use the existing online software to build URL 2 and URL 3.
If I only need to download once for URL 2 and URL 3 so I can work locally then upload FTP, how do I do that?
Those are the specific questions. Are there specific answers? Thanks for all your help/