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ExternalSessions   
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ExternalSessions

Listing of External Evaluators »
Unsupported in Public Cloud[Experimental]

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gives the list of currently active external evaluator sessions.

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gives the list of sessions associated with the system sys.

Details

Examples

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Basic Examples  (3)Summary of the most common use cases

Start a session and see it listed with ExternalSessions:

In[1]:=1
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https://wolfram.com/xid/05fl98mpf4-hjdpe8
Out[1]=1

Delete the session object:

In[2]:=2
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https://wolfram.com/xid/05fl98mpf4-6xldfr

Now the session is not present in ExternalSessions:

In[3]:=3
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https://wolfram.com/xid/05fl98mpf4-7akgzh
Out[3]=3

Start sessions and list them independently by specifying the system:

In[1]:=1
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https://wolfram.com/xid/05fl98mpf4-0nrw37
Out[1]=1
Out[1]=1

ExternalSessions[sys] only shows sessions for that system:

In[2]:=2
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https://wolfram.com/xid/05fl98mpf4-fxvm6r
Out[2]=2
In[3]:=3
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https://wolfram.com/xid/05fl98mpf4-72a1yc
Out[3]=3

Delete the session objects:

In[4]:=4
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https://wolfram.com/xid/05fl98mpf4-nynauu

Start some sessions and delete all of them with DeleteObject and ExternalSessions:

In[1]:=1
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https://wolfram.com/xid/05fl98mpf4-jmed9j
Out[1]=1

DeleteObject works with a list of more than one ExternalSessionObject:

In[2]:=2
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https://wolfram.com/xid/05fl98mpf4-fa0ha6

Scope  (1)Survey of the scope of standard use cases

Sessions are automatically removed from ExternalSessions once they are deleted:

In[1]:=1
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https://wolfram.com/xid/05fl98mpf4-t965o6
Out[1]=1
In[2]:=2
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https://wolfram.com/xid/05fl98mpf4-5edoca
Out[2]=2

Neat Examples  (1)Surprising or curious use cases

Start sessions to list all their properties:

In[1]:=1
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https://wolfram.com/xid/05fl98mpf4-7vso05

Make a dataset of the various properties of all the sessions:

In[2]:=2
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https://wolfram.com/xid/05fl98mpf4-s6sy9q
Out[2]=2
Wolfram Research (2017), ExternalSessions, Wolfram Language function, https://reference.wolfram.com/language/ref/ExternalSessions.html (updated 2020).
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Wolfram Research (2017), ExternalSessions, Wolfram Language function, https://reference.wolfram.com/language/ref/ExternalSessions.html (updated 2020).

Text

Wolfram Research (2017), ExternalSessions, Wolfram Language function, https://reference.wolfram.com/language/ref/ExternalSessions.html (updated 2020).

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Wolfram Research (2017), ExternalSessions, Wolfram Language function, https://reference.wolfram.com/language/ref/ExternalSessions.html (updated 2020).

CMS

Wolfram Language. 2017. "ExternalSessions." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2020. https://reference.wolfram.com/language/ref/ExternalSessions.html.

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Wolfram Language. 2017. "ExternalSessions." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2020. https://reference.wolfram.com/language/ref/ExternalSessions.html.

APA

Wolfram Language. (2017). ExternalSessions. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/ExternalSessions.html

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Wolfram Language. (2017). ExternalSessions. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/ExternalSessions.html

BibTeX

@misc{reference.wolfram_2025_externalsessions, author="Wolfram Research", title="{ExternalSessions}", year="2020", howpublished="\url{https://reference.wolfram.com/language/ref/ExternalSessions.html}", note=[Accessed: 29-March-2025 ]}

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@misc{reference.wolfram_2025_externalsessions, author="Wolfram Research", title="{ExternalSessions}", year="2020", howpublished="\url{https://reference.wolfram.com/language/ref/ExternalSessions.html}", note=[Accessed: 29-March-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_externalsessions, organization={Wolfram Research}, title={ExternalSessions}, year={2020}, url={https://reference.wolfram.com/language/ref/ExternalSessions.html}, note=[Accessed: 29-March-2025 ]}

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@online{reference.wolfram_2025_externalsessions, organization={Wolfram Research}, title={ExternalSessions}, year={2020}, url={https://reference.wolfram.com/language/ref/ExternalSessions.html}, note=[Accessed: 29-March-2025 ]}