Computers in the 40's were used to perform calculations for the military of the country that developed it. The Z3 in Germany was the first such computer, with the American Harvard-IBM MARK I and ENIAC, along with the English Colossus coming soon after that.
Computer passwords really were not used in 1940 because few people had any clue how to use a computer and access control to the very few existing computers was maintained via control of physical access to the computers. Since the computers were not networked, there was no concern about someone coming in over a (nonexistent) network.
1940
The first electronic digital computers were developed between 1940 and 1945 in the United Kingdom and United States.
Before computers, people did calculations by hand.
why computers used in government
Computers are used for everything
How Are Computers Used Today?
There are many types of controllers used in computers.
Please reword your question for clarity. Do you mean How are computers used by flight attendants? How are computers used in flight attendant training? How are computers used by airlines to schedule flight attendants?
who would buy used computers
no, second generation. third generation computers used ICs.
No I don't think that there were computers in the 1940's TV's just started in the 50's if there were computers (which I highly doubt) thaey wouldn't be anything like today's computers. A little bit of searching will show that there were primitive computers. They were mostly mechanical analog computers rather than electronic digital devices like we have today. They were mostly used for computing bomb and rocket trajectories. Some very early electronic computers were built in England and the U.S. to help decode encrypted Axis messages.