Info from Tachnomate site

[alunfennell]

Record one channel and view another at the same time
TM-5200d super-5300d+Super TM-5400 ci+super TM-5600ci,
Now you can record one channel and watch another
with one Lnb input. Connect USB or external USB hard disk
press record,Few seconds later press ok and see the list
of channel that you surf in the same TP,

[.: JaCkPoT :.]

I think this has been out now for a while and people who have the receivers do find it handy...especially when premiere was still here.