The two ways I can think that you could track this are to create Project folders for all of your apps. When any changes to your app occur files in the project folder are updated. As these files are plain text you could create an app that will go through and read these text files and notice new sheets.
The other approach will be to turn on full audit logging on the server, and this then logs users clicking through your apps. You will then be able to see when users have accessed that tab.
That covers sheets for existing apps.
To know about new apps you need to monitor the file system where they are created. You can do this by recursing around the file system;
for each vFile in FileList('.\*,qvw')
LOAD
'$(vFile)' as FileName
AUTOGENERATE(1);
next
If you then persist this list to QVD and load the previous data alongside the most recent you could spot new entries.
You can also drill into subfolders by using Subs and the DirList function. I suspect you will be able to find code for this on Community.
Hope that helps.
Steve
