Does it just duplicate the screen or does it allow you to have to different work screens?

It depends on how you set it up using your operating system. You can set it up in settings according to your preferences.

Does this work for extending displays or for mirror only?

I actually ended up returning this item since it couldn't handle the dual monitors I purchased. I will say that the company I purchased it from was very forgiving.

Questions & Answers: StarTech.com DMSVGAVGA1 Black LFH 59 Male to Dual Female VGA DMS 59 Cable

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StarTech.com DMSVGAVGA1 Black LFH 59 Male to Dual Female VGA DMS 59 Cable

Connect two VGA monitors to your DMS / LFH graphics card
Split the video from your LFH graphics card to two VGA monitors
DMS 59 to VGA Adapter / DMS to VGA Splitter
Connect two VGA monitors to a single graphics card port
Guaranteed reliability
Compatible with computers which are equipped with DMS / LFH graphics cards such as the HP EliteDesk 700 series / HP ProDesk 400 Desktop PC series / HP Z200 Workstation series and more

Out of Stock