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Could someone point me in the right direction for sending commands to Media Portal (is there an API?).

An example of a plugin that would use this is a remote control plugin, or a web interface plugin.  The remote control plugin knows that it wants to change the channel up, but how does this get sent to Media Portal? Do I have to emulate keystrokes?

I am not yet familiar with all the code in Media Portal so if there is a particular place I should look I would appreciate the guidance.f