Unity Webplayer and Dlls

Hi,

I just wanted some clarification about Unity Webplayer and Dlls. It seems to be possible the use Dlls in a Webplayer but sometimes I see that it’s not possible ?
In which case we can’t use Dlls for Webplayer ?
From what I think, It’s not possible to load Dlls Dynamically in the Webplayer because of some security reason. But if we include the Dlls in the project there is no problems ?

From the documentation :

Thanks a lot for you clarification.

Plugins are native code DLLs. If a DLL contains only Mono/.NET code which can be statically included inside your build then it’s not a “plugin”, it’s just some pre-compiled code, and that can work.

Just wondering.
If I want to do some math calculation in C++ then use it like static dll.
This isn’t possible for web player, but will work for other platforms, am I right??