R functions for handling multiple processes.

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exit Exit from a child process
fork Create a new R process using the Unix 'fork' system call
getpid Obtain the process id for the current process.
kill Send a signal to one or more processes.
killall Send a signal to one or more processes.
siglist Obtain information about signals
signame Obtain information about signals
sigval Obtain information about signals
wait Wait for child process(es) to stop or terminate.