 With 1970s technology, the ability to generate of so many characters on demand in the end-user's terminal was seen as prohibitive.Instead, development focussed on methods to send pages to user terminals pre-rendered, using coding strategies similar to facsimile machines.This led to a videotex system called Captain ("Character and Pattern Telephone Access Information Network"), created by NTT in 1978, which went into full trials from 1979 to 1981.