Including TortoiseMerge in a commercial non-GPL application - possible?

Hello,

A licensing question comes. I know that it's best to ask lawyers for
that info, but I wanted to ask developers as well.

The situation is this: I'm making a commercial non-GPL piece of
software. At some point, that software has two text files and I need a
way to visually display the differences between them. So the most
straightforward way would be to include some visual diff program
inside my software and launch it. For example TortoiseMerge.

Now, TortoiseMerge is GPL licensed. My program is closed source, non-
GPL. Is it ok/legal/ethical to take TortoiseMerge, include it in my
installer, install it somewhere inside my application's folder, and
invoke it?

From my reading of GPL FAQ (http://www.gnu.org/licenses/gpl-
faq.html#NFUseGPLPlugins), it looks like that would be legal. I'm not
linking to TortoiseMerge, I'm just invoking it as a separate program.
The questions are: 1) is my understanding of GPL is correct, and 2)
would TortoiseSVN developers be okay with me doing that?

--
Aras Pranckevicius
work: http://unity3d.com
home: http://aras-p.info
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