openIn "!cmd" -- opens an input file which corresponds to a pipe receiving the output from the shell command cmd .
openIn "$hostname:service" -- opens a socket and returns a file which can be used both for input and output. There must be a process accepting connections for the desired service on the specified host. This feature is not available on Sun computers, because Sun doesn't provide static versions of crucial libraries dealing with network communications.
The class of all files is File.
See also File.
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