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   In the terminology of operating systems, a "process" is a space in
which a program can execute.  Emacs runs in a process.  Emacs Lisp
programs can invoke other programs in processes of their own.  These are
called "subprocesses" or "child processes" of the Emacs process, which
is their "parent process".

   A subprocess of Emacs may be "synchronous" or "asynchronous",
depending on how it is created.  When you create a synchronous
subprocess, the Lisp program waits for the subprocess to terminate
before continuing execution.  When you create an asynchronous
subprocess, it can run in parallel with the Lisp program.  This kind of
subprocess is represented within Emacs by a Lisp object which is also
called a "process".  Lisp programs can use this object to communicate
with the subprocess or to control it.  For example, you can send
signals, obtain status information, receive output from the process, or
send input to it.

 - Function: processp OBJECT
     This function returns `t' if OBJECT is a process, `nil' otherwise.

* Subprocess Creation
Functions that start subprocesses.
* Synchronous Processes
Details of using synchronous subprocesses.
* Asynchronous Processes
Starting up an asynchronous subprocess.
* Deleting Processes
Eliminating an asynchronous subprocess.
* Process Information
Accessing run-status and other attributes.
* Input to Processes
Sending input to an asynchronous subprocess.
* Signals to Processes
Stopping, continuing or interrupting an asynchronous subprocess.
* Output from Processes
Collecting output from an asynchronous subprocess.
* Sentinels
Sentinels run when process run-status changes.
* Transaction Queues
Transaction-based communication with subprocesses.
Opening network connections.

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