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Interoperability.
In the early days of the telephone, several competing companies sprang
up. Each had their own telephone lines, and the customers of one
company could only make calls to other subscribers to the same
company. Businesses would often have several different telephones,
one for each company, so that anyone could phone them.
In the early decades of the twentieth century--between 1910 and 1920,
if I recall correctly--things began to change. Telephone systems were
hooked together so that anyone with a telephone could call anyone
else. History was repeated in the early days of online computing
services.
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