Merge pull request #88288 from laurenhughes/patch-9

Update app package var description

Author: PRMerger9

articles/batch/batch-compute-node-environment-variables.md

@@ -10,7 +10,7 @@ ms.service: batch
 ms.topic: article
 ms.tgt_pltfrm: vm-windows
 ms.workload: big-compute
-ms.date: 08/13/2019
+ms.date: 09/12/2019
 ms.author: lahugh
 ---
 
@@ -44,7 +44,7 @@ The command lines executed by tasks on compute nodes do not run under a shell. T
 |-----------------------------------|--------------------------------------------------------------------------|--------------|---------|
 | AZ_BATCH_ACCOUNT_NAME           | The name of the Batch account that the task belongs to.                  | All tasks.   | mybatchaccount |
 | AZ_BATCH_ACCOUNT_URL            | The URL of the Batch account. | All tasks. | `https://myaccount.westus.batch.azure.com` |
-| AZ_BATCH_APP_PACKAGE            | A prefix of all the app package environment variables. For example, if Application “Foo” version “1” is installed onto a pool, the environment variable is AZ_BATCH_APP_PACKAGE_FOO_1. AZ_BATCH_APP_PACKAGE_FOO_1 points to the location that the package was downloaded (a folder). | Any task with an associated app package. Also available for all tasks if the node itself has application packages. | AZ_BATCH_APP_PACKAGE_FOO_1 |
+| AZ_BATCH_APP_PACKAGE            | A prefix of all the app package environment variables. For example, if Application “Foo” version “1” is installed onto a pool, the environment variable is AZ_BATCH_APP_PACKAGE_FOO_1. AZ_BATCH_APP_PACKAGE_FOO_1 points to the location that the package was downloaded (a folder). When using the default version of the app package, use the AZ_BATCH_APP_PACKAGE environment variable without the version numbers. | Any task with an associated app package. Also available for all tasks if the node itself has application packages. | AZ_BATCH_APP_PACKAGE_FOO_1 |
 | AZ_BATCH_AUTHENTICATION_TOKEN   | An authentication token that grants access to a limited set of Batch service operations. This environment variable is only present if the [authenticationTokenSettings](/rest/api/batchservice/task/add#authenticationtokensettings) are set when the [task is added](/rest/api/batchservice/task/add#request-body). The token value is used in the Batch APIs as credentials to create a Batch client, such as in the [BatchClient.Open() .NET API](https://docs.microsoft.com/dotnet/api/microsoft.azure.batch.batchclient.open#Microsoft_Azure_Batch_BatchClient_Open_Microsoft_Azure_Batch_Auth_BatchTokenCredentials_). | All tasks. | OAuth2 access token |
 | AZ_BATCH_CERTIFICATES_DIR       | A directory within the [task working directory][files_dirs] in which certificates are stored for Linux compute nodes. This environment variable does not apply to Windows compute nodes.                                                  | All tasks.   |  /mnt/batch/tasks/workitems/batchjob001/job-1/task001/certs |
 | AZ_BATCH_HOST_LIST              | The list of nodes that are allocated to a [multi-instance task][multi_instance] in the format `nodeIP,nodeIP`. | Multi-instance primary and subtasks. | `10.0.0.4,10.0.0.5` |