[xwiki-users] applications in wiki-farm fail to run

Hi! Xwiki 3.1. Latest XEM works fine, deploys wiki farms - no problem. All attempts to make applications running on wiki-farm failed (e.g. Annotations). Documentation keeping silence, or I'm missing something. :-( Is there any way to make applications running on non-main wikis? Is there a way to install application in main wiki and "grant permission" to be used in specific wiki-farm? Thanks a lot in advance Dmitry Bakbardin