This code is an example of how you can get the host id that a content editor is on, and based on that host ID it will show or hide a tab in the content editing screen.
The example assumes you have a tab field divider with a velocity variable name: otherData
#set($sessionHost = $request.getSession().getAttribute("CMS_SELECTED_HOST_ID")) #if($sessionHost != "8ae39afa-19bc-4f20-ad8c-95bd73d76109") <script> dojo.addOnLoad(function(){ dijit.byId('mainTabContainer').removeChild(dijit.byId('otherData')); }) </script> #end