Okay, you need to get very familiar with lubuntu-rc.xml!
Here is a nice link: http://pclosmag.com/html/Issues/201107/page08.html
Basically, you'll edit the appropriate section of ~/.config/openbox/lubuntu-rc.xml to ensure that windows open undecorated.
For that, you'll need to play with the lines in the <applications> section, near the very end of the file.
Code:
<application type="normal">
<maximized>true</maximized>
<decor>no</decor>
</application>
will open all application windows full-sized, without decoration.
Also take a look at https://help.ubuntu.com/community/Lu...dows_Maximized. That mentions a GUI-based option as well but you need to do a bit of groundwork ensuring that program's dependencies are met.
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