Finder view like FTP clients - two columns
No dual mode in OS X Finder

There is no native dual mode in OS X Finder. You can replace Finder with software like 'TotalFinder' (image below). Or you can use window managing software, like ShiftIt or mjolnir, to place your Finder windows side-by-side.

Mjolnir (donation ware) is highly scriptable and should be capable of doing exactly this.

This feature is requested lots of times, but for now we are stuck with the classic Finder as we know it. Besides tabs, the only view options we have are:


Command1 - icons 
Command2 - list 
Command3 - columns 
Command4 - Cover Flow 


TotalFinder, dual mode: