How to monitor skype for business desktop sharing session with remote user

[Anil Singh]

We have users share the desktop with remote users and we want to popup appear in lync/skype after x amount of time to remind that still sharing is goingon.

I read that using lync SDK we can develop it but want to hear if any other better idea.

[#2]

I've not seen a product myself, but have seen users forget that their sharing is still running.
In my opinion it comes down to training (and I've covered it there) on educating people on good sharing techniques (ie. sharing app vs, desktop, presenting slides vs. sharing the PowerPoint window) which also includes remember to stop sharing.
Conversely this is also something that viewers need to be respectful of and call it out to the person sharing their screen.

[#3]

As Loryan says, that's not a native feature and can't be done outside custom development. The best you get natively is the yellow banner reminder that you're still sharing your screen once you leave the audio portion of the call, rather than the intermittent reminder that you're after;

Kind regards
Ben