Unfortunately no one can be told what fun_plug is - you have to see it for yourself.
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I am a user of DNA 320L and I am running Alt-F for 1.5 years. You made a wonderful job with this.
However I need to extend the NAS and I would like to buy DNS 340L. But without ALT-F I will not buy it. My question is, if I can use ALT-F on this hardware too.