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    Returns an enveloped result (an array).

    First element ($status_code) is an integer containing HTTP-like status
    code (200 means OK, 4xx caller error, 5xx function error). Second
    element ($reason) is a string containing error message, or something
    like "OK" if status is 200. Third element ($payload) is the actual
    result, but usually not present when enveloped result is an error
    response ($status_code is not 2xx). Fourth element (%result_meta) is
    called result metadata and is optional, a hash that contains extra
    information, much like how HTTP response headers provide additional
    metadata.

    Return value: (any)

  opera_is_running
    Usage:

     opera_is_running(%args) -> [$status_code, $reason, $payload, \%result_meta]

    Check whether Opera is running.

    Opera is defined as running if there are some Opera processes that are
    *not* in 'stop' state. In other words, if Opera has been started but is
    currently paused, we do not say that it's running. If you want to check
    if Opera process exists, you can use "ps_opera".

    This function is not exported.

    Arguments ('*' denotes required arguments):

    *   quiet => *true*

    *   users => *array[unix::uid::exists]*

        Kill browser processes that belong to certain user(s) only.

    Returns an enveloped result (an array).

    First element ($status_code) is an integer containing HTTP-like status
    code (200 means OK, 4xx caller error, 5xx function error). Second
    element ($reason) is a string containing error message, or something
    like "OK" if status is 200. Third element ($payload) is the actual
    result, but usually not present when enveloped result is an error
    response ($status_code is not 2xx). Fourth element (%result_meta) is
    called result metadata and is optional, a hash that contains extra
    information, much like how HTTP response headers provide additional
    metadata.

    Return value: (any)

  pause_opera
    Usage:

     pause_opera(%args) -> [$status_code, $reason, $payload, \%result_meta]

    Pause (kill -STOP) Opera.

    A modern browser now runs complex web pages and applications. Despite
    browser's power management feature, these pages/tabs on the browser
    often still eat considerable CPU cycles even though they only run in the
    background. Pausing (kill -STOP) the browser processes is a simple and
    effective way to stop CPU eating on Unix and prolong your laptop battery
    life. It can be performed whenever you are not using your browser for a
    little while, e.g. when you are typing on an editor or watching a movie.
    When you want to use your browser again, simply unpause (kill -CONT) it.

    This function is not exported.

    Arguments ('*' denotes required arguments):

    *   users => *array[unix::uid::exists]*

        Kill browser processes that belong to certain user(s) only.

    Returns an enveloped result (an array).

    First element ($status_code) is an integer containing HTTP-like status
    code (200 means OK, 4xx caller error, 5xx function error). Second
    element ($reason) is a string containing error message, or something
    like "OK" if status is 200. Third element ($payload) is the actual
    result, but usually not present when enveloped result is an error
    response ($status_code is not 2xx). Fourth element (%result_meta) is
    called result metadata and is optional, a hash that contains extra
    information, much like how HTTP response headers provide additional
    metadata.

    Return value: (any)

  ps_opera
    Usage:

     ps_opera(%args) -> [$status_code, $reason, $payload, \%result_meta]

    List Opera processes.

    This function is not exported.

    Arguments ('*' denotes required arguments):

    *   users => *array[unix::uid::exists]*

        Kill browser processes that belong to certain user(s) only.

    Returns an enveloped result (an array).

    First element ($status_code) is an integer containing HTTP-like status
    code (200 means OK, 4xx caller error, 5xx function error). Second
    element ($reason) is a string containing error message, or something
    like "OK" if status is 200. Third element ($payload) is the actual
    result, but usually not present when enveloped result is an error
    response ($status_code is not 2xx). Fourth element (%result_meta) is
    called result metadata and is optional, a hash that contains extra
    information, much like how HTTP response headers provide additional
    metadata.

    Return value: (any)

  restart_opera
    Usage:

     restart_opera(%args) -> [$status_code, $reason, $payload, \%result_meta]