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This may be a silly question, but I don't know much about boot discs etc.
Firstly you can have a 'mod chip' fitted. These invalidate any warranty on your Dreamcast, run the risk of overheating and forcing resets just when you're not expecting them. Most companies just post you the chip and instructions on how to fit it yourself. (You'll need to know how to use a soldering iron.) The cost varies from £20 for a DIY kit to £70 for a fitted service.
In March 2001 Australia passed legislation making these types of modification in any videogame system illegal, an unusual step, but one which other countries my follow.
The second easier way is to use a 'boot' disc. This was originally developed as a pirating tool. Because the Dreamcast uses GD-Rom discs, the boot disc is inserted into the Dreamcast first and provides instructions to the console to treat whatever format of disc is inserted next as GD-Rom format. The boot disc is then removed, a standard CD-Rom with a copied game from any region is inserted, and the Dreamcast plays it as a normal game.
The problem with this method is that the boot disc won't always work depending on who coded it, but they only cost £5.00 or so. The boot disc paved the way for mass scale pirating of videogames on the Dreamcast.
Unfortunately for the videogame industry, both mod chips and boot discs are widely available from the web. The game industry should really release games without regional coding, which was pioneered by the Hollywood movie industry to enable fair distribution of marketing funds for individual movie releases. This would rule out the need for mod chips and boot discs, and the only reason left to chip or use a boot disc then would be to use pirated games.