feed: a worked URL-parameter example for the hook read, and the generated cover

content/feed/support-diagnostics/index.md

@@ -64,16 +64,26 @@ Those are the services that run customer code. The viewer's `viewlibs`, `viewtab
 
 ## Reading them in a hook
 
-A hook script is `%include`d into the running service, so it shares the service's WORK library and can read the tables directly. A URL parameter by name:
+A hook script is `%include`d into the running service, so it shares the service's WORK library and can read the tables directly. Take an embedded editor opened at:
+
+```
+https://datacontroller.io/#/editor/SASHELP.CLASS?labels=true&embed=va
+```
+
+`browser_url_vars` then holds a row per parameter - `labels=true` and `embed=va` - and a hook can read either by name:
 
 ```sas
 %let labels=N;
+%let embed=N;
 
 %if %sysfunc(exist(work.browser_url_vars)) %then %do;
   proc sql noprint;
     select value into :labels
     from work.browser_url_vars
     where name = 'labels';
+    select value into :embed
+    from work.browser_url_vars
+    where name = 'embed';
   quit;
 %end;
 ```