Fernando Corbató, whose work on Compatible Time-Sharing System (CTSS) paved the way for the personal computer and the computer password has passed away at the age of 93.
CTSS allowed multiple users in different locations to access a single computer simultaneously through telephone lines.
It was developed at MIT Computation Centre in the USA during the 1960s and 70s.
CTSS gave way to more modern MS-DOS systems in the 1980s and on to modern Windows and OSx systems in use today.