I need a reliable way to detect if it is running on SkaDate or OxWall.

I suppose that SkaDate will have some extension that can be located, until now I was based on the Winks plugin that is not available for OxWall but it does not work, it may be that a SkaDate installation does not have it installed.

Perhaps there is another similar plugin in Skadate that cannot be uninstalled, and so in my plugin I only change to find if there is another plugin instead of this one.