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