system
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http://www.sandboxie.com/index.php?FAQ_Licensing
Q. Which features are available in the paid version?
A. Two features:
• "Force" programs: Automatically run programs under Sandboxie even when they are not started directly through Sandboxie. Programs can be "forced" by name or by containing folder.
• Run programs in more than one sandbox at the same time. This causes error SBIE1303 in the free version.
The first one is very useful (a.k.a. set up Sandboxie in a way that BFUs won’t have to deal with sandbox details and yet won’t be able to infect the machine by browsing pr0n and warez sites).