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What is the minimum size for embedding a Metaplace world?

Minimum size should be 400 pixels in height and widht. Otherwise people cannot login, because the "Enter this world" line is not shown in the frame.

I don't see any border around my embedded world

Borders have been deliberately turned off in the plugin. If you want to get rid of this you may edit the mp2wp.php and remove all occurances of the HTML code frameborder="0".

How do I add a virtual world to a blog-post?

To add a virtual world to any post or page just add the markup [mp2wp]worldname,width,height[/mp2wp], for instance [mp2wp]ComicEmporium,500,450[/mp2wp]. Note that supplying the worldname is mandatory while the width and height parameters are optional. Which means that you may specify only the worldname or only the worldname & width. Therefore, [mp2wp]ComicEmporium,500[/mp2wp] and [mp2wp]ComicEmporium[/mp2wp] are valid tags. Also note that the order of width & height is important and worldname, width and height must be separated with commas. Lastly, the closing tag [/mp2wp] is mandatory.

Can I add multiple embedded worlds on a post or page?

Yes you can. Just add multiple [mp2wp] tags where required. All of these can be configured independently.

Can I add multiple mp2wp widgets on the sidebar?

Unfortunately no. As of now you can only add one instance on the sidebar.