As the system expanded, especially after the addition of string handling in BASIC, the DTSS system became a major platform for the development of many text-based games. In the early 1970s, the People's Computer Company began publishing these in their magazine, typically converted to the more widely available HP BASIC. Many of these listings were collected in their 1975 book, "What to do after you hit return". Although these are published in HP BASIC form, the majority of them trace their history to either DTSS or the Lawrence Hall of Science in California where a similar machine was set up, known as DECISION.