No you're right, SNEmulDS does use a paging system to load up chunks of ROM into RAM as needed so that larger games can run. jEnesisDS does not do this, and it's possible that it could be implemented somehow.
However, what ds benjmin is asking about is a "page file" which is different. A page file sits on your hard drive and acts directly as RAM, and the computer stores information there as needed. On your computer, open up Task Manager and go to the Performance tab to see how much of your page file you're currently using. This is done so that, among other things, the computer doesn't crash when it runs out of the amount of RAM actually installed, basically letting you use more RAM than you actually have available. If the DS could use a page file, it would let applications use more than 4 MB of RAM without having to rely on a slot-2 RAM pack, as the DS would write information to the page file if needed. The application would see it all as RAM, though the DS would know the difference.
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