Just like the ZX Spectrum Next, the QL uses device names denoted by a specific identifier to communicate with its devices. Whereas on the ZX Spectrum Next this usually is a single letter followed by a colon for the SD card and a combination of letters, numbers and symbols for other devices, on the QL device names are very consistently named by ... More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.