DVI-D amp

if anyone is bored or has some spare time could they have a look at the link below and maybe post
www.extron.com/product/product.aspx?id=d2da4dvi

It's a DVI-D amp which i'm hoping to mount in an axon rack so i can have a preview monitor at FOH and send the axon output elsewhere.
As i'm not 100% on av terminology can someone explain what they mean that the "DDC signal is routed to output 1".
if anyone has seen something like this that you can manually switch the output's on/off would appreciate,did see one where you could select 2 outputs that you wanted active,as i could then preview server content before it's live so to speak,


Regards C