Merge pull request #284533 from mayankdaruka-msft/mayankdaruka/vmapps-docs-fix

VMApps Docs: Clarify behavior of 'start /wait' command

Author: prmerger-automator[bot]

articles/virtual-machines/vm-applications.md

@@ -455,6 +455,14 @@ Example remove command:
 start /wait %windir%\\system32\\msiexec.exe /x $appname /quiet /forcerestart /log ${appname}_uninstall.log
 ```
 
+Typically, the `start` command would be called within a batch script. If used with the `/wait` parameter, the calling script will be paused until the called process terminates. Once complete, the batch script would check for the `errorlevel` variable set by the `start` command and exit as follows:
+ 
+```batch
+start /wait %windir%\\system32\\msiexec.exe /i myapp /quiet /forcerestart /log myapp_install.log
+if %errorlevel% neq 0 exit /b %errorlevel%
+...
+```
+
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