--- loncom/html/adm/help/tex/Course_Prefs_ExternalTools.tex	2024/01/25 19:19:52	1.1
+++ loncom/html/adm/help/tex/Course_Prefs_ExternalTools.tex	2025/06/16 23:12:28	1.3
@@ -2,11 +2,11 @@
 
 The domain coordinator for your domain can choose to enable definition and configuration of External Tools by course type, or for specific course(s). If tool definition is available in your course you will be able to use: Settings $>$ Course Settings $>$ Display (``External Tools'' checked) to create new External Tool definitions for use in your course, or to modify existing ones.
 
-Note: External Tools may also have been defined at a domain level for use in your course. If the tool you want to use is already available then you do not need to define your own, but can simply click``External'' in the function categories listed at the right side of the Course Editor, below the editor tabs, and then click ``External Tool''. From there you'll choose `` Defined in domain'' and select the tool to add.  If the tool you want to use is not available at a domain level, then after you have defined the tool (see below) clicking the ``Defined in course'' option will allow you to add an instance of that tool to the folder currently being edited.  Tools added to the ``Supplemental content'' area will not store grades passed back from the Provider. If you wish to use that functionality you should add a tool instance to a folder or sub-folder in the ``Main Content'' area, and check ``Yes'' for Gradable.
+Note: External Tools may also have been defined at a domain level for use in your course. If the tool you want to use is already available then you do not need to define your own, but can simply click ``External'' in the function categories listed at the right side of the Course Editor, below the editor tabs, and then click ``External Tool''. From there you'll choose `` Defined in domain'' and select the tool to add.  If the tool you want to use is not available at a domain level, then after you have defined the tool (see below) clicking the ``Defined in course'' option will allow you to add an instance of that tool to the folder currently being edited.  Tools added to the ``Supplemental content'' area will not store grades passed back from the Provider. If you wish to use that functionality you should add a tool instance to a folder or sub-folder in the ``Main Content'' area, and check ``Yes'' for Gradable.
 
-By defining an External Tool in a course you enable use of LON-CAPA as an LTI Consumer (where LTI = Learning Tool Interoperability). Under the LTI protocol, the user's identity, as well as the course context, can be sent to the external tool (the Provider), which will trust the identity and role information provided by LON-CAPA (the Consumer). Any LON-CAPA data being provided are included in an encrypted form in the tool launch page sent to the user's web browser by LON-CAPA. The external tool will assign appropriate privileges to the user within the tool, based on the user's role.
+By defining an External Tool in a course you enable use of LON-CAPA as an LTI Consumer (where LTI = Learning Tool Interoperability). Under the LTI protocol, the user's identity, as well as the course context, can be sent to the external tool (the Provider), which will trust the identity and role information provided by LON-CAPA (the Consumer). Integrity of data in the payload sent by LON-CAPA to the user's web browser, which the browser then submits to the Provider, is assured by including a signature in the payload which the Provider must verify on receipt. The external tool will assign appropriate privileges to the user within the tool, based on the user's role.
 
-The shared key and secret used to encrypt data sent to the Tool Provider are typically provided to you when contact the Provider to let them know you would like to use their tool with your Learning Management System, i.e., with LON-CAPA at your institution.
+The shared key and secret used to sign the payload sent to the Tool Provider on launch are typically provided to you when contact the Provider to let them know you would like to use their tool with your Learning Management System, i.e., with LON-CAPA at your institution.
 
 When you use Settings $>$ Course Settings $>$ Display (``External Tools'' checked) a table will be displayed listing all currently available External Tools (i.e., LTI Providers) defined in the course, as well as an ``Add'' checkbox (for the last row in the table), used to add a new External Tool.
 
@@ -26,7 +26,7 @@ Each External Tool can be configured to
 
 \item{\textbf{Optional settings}}
 
-There are five optional settings, for which you can set default values, which optionally you may allow to be overridden for each tool instance: Display target (iFrame, Tab, or Window), Width and Height (if target is Window), default link text, and default explanation.
+There are seven optional settings, for which you can set default values, which optionally you may allow to be overridden for each tool instance: Display target (iFrame, Tab, or Window), Width and Height (if target is Window), default link text and explanation (unless target is iFrame), destination URL (if different from Provider URL), and return LON-CAPA URL.
 
 Optionally, you can also:
 \begin{itemize}
@@ -37,7 +37,7 @@ Optionally, you can also:
 
 \item{\textbf{User data sent on launch}}
 
-For each External Tool, you will set what data are sent when it is launched. You can choose to send any or all of: Full Name, First Name, Last Name, E-mail address, Role (i.e., current ``LTI'' role, as determined from current role in LON-CAPA), and User (either username or username:domain) for the user launching a tool instance in a course.
+For each External Tool, you will set what user data are sent when it is launched. You can choose to send any or all of: Full Name, First Name, Last Name, E-mail address, Role (i.e., current ``LTI'' role, as determined from current role in LON-CAPA), and User (either username or username:domain) for the user launching a tool instance in a course.
 
 \item{\textbf{Role mapping}}
 
@@ -47,11 +47,11 @@ For each tool you will set mapping to an
 
 \item{\textbf{Configurable in course}}
 
-The five optional settings: display target (and width and height, when target is window), default link text, and default explanation can be set to be configurable for each instance of a tool in a course.
+The seven optional settings: display target (and width and height, when target is window), default link text and explanation (when target is tab or window), different destination URL, and return LON-CAPA URL, can be set to be configurable for each instance of a tool in a course.
 
 In addition, two other items sent on launch to the external tool - Course label and Course title - can be set to be configurable for each tool instance. If Course label is not configurable, the institutional course code for the LON-CAPA course will be used, whereas if Course title is not configurable, the LON-CAPA course title will be used, respectively, for context\_label and context\_title, as part of the data sent to the external tool on launch.
 
-Lastly, the Provider URL can be set to be configurable, so that text, such as a path or query string, will be appended to the default Provider URL to which the encrypted LTI data are sent on launch can. The text appended can potentially be unique for each tool instance.
+Lastly, the Provider URL can be set to be configurable, so that text, such as a path or query string, will be appended to the default Provider URL to which the signed LTI data are sent on launch. The text appended can potentially be unique for each tool instance.  If there is a need to deep-link to a particular location in the Provider, post-launch, and the Tool Provider supports use of an appended string, this would be preferred to specification of a different destination URL (see above), as the latter is performed with client-side javascript with the need to specify a delay between launch and redirect.
 
 \item{\textbf{Custom items sent on launch}}
 
@@ -78,6 +78,7 @@ ext_ims_lis_memberships_id
 launch_presentation_document_target
 launch_presentation_locale
 launch_presentation_height
+launch_presentation_return_url
 launch_presentation_width
 lis_outcome_service_url
 lis_person_contact_email_primary