While the Datel products are the only ones available offline, they are also among the worst homebrew devices available. If you absolutely must go with them however, get a Max Media Dock (the one where you supply your own CF card). The GnM does not have a DLDI file made for it at the moment, making it utterly useless for a large percentage of homebrew.
Again though, I'd highly recommend looking at the devices you can buy online.
Installing programs is as simple as plugging the media card into a card reader and copying files to it.
DLDI is basically a dynamic "filesystem access code" thing. Developers reserve a 32 kb segment in the program for filesystem access code, and you patch in the code for your specific device. This allows for the same homebrew program to run on any device that has DLDI support. As the GnM has no DLDI file, only homebrew that does not access the filesystem will work with it.
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