Smog
Dacs such as Norms and the one I built for Mamba when I first got it use the parallel port to output the data and the DAC has the ilda connector on it. The dongle is a security device that plugs into the USB and is not relevant to the hardware - just the software.
As for legalities - there is no law specific for using a laser in the UK but you must adhere to health and safety guidelines for lasers and follow general H&S rules when putting on a show. Most of this is about ensuring you are operating in a responsible way taking the safety of your 'audience' as a prime concern.
If you want to learn how to do it - you can do worse tha go on one of the laser visuals safety training courses that run from time to time.
There will be plenty of advice at the meet on Sunday
Rob


stanwax
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