“ILDA laser” only means that the device is capable of receiving and being controlled by ILDA control signal. Even these days quite a few people still think, that if their laser is ILDA, it means that it is a high quality, fully professional laser system. Over the years the term “ILDA laser” became somehow quite popular - mainly within mobile DJs, hobbyists and community of non-professional laserist. If this is not the case, you can daisy-chain the ILDA signal between multiple projectors and they will all do the same thing.
In order to control multiple ILDA laser systems, one ILDA interface must be used per each laser display system in a given setup - that’s if you want to control each laser projector individually. To turn the computer control signal into ILDA control signal, you have to use an ILDA compatible interface (DAC).
ILDA protocol was developed many years ago and ensures full compatibility between all laser projectors and control systems made by manufacturers that follow this standard. ILDA acronym stands for International Laser Display Association but it’s more likely to be used as the name for standardised data communication protocol between ILDA compatible single colour, multiple-colour or RGB laser display projectors and laser control computers (via ILDA interface).