Before being edited this answer was suggesting that elementary OS does not have a system tray.

I would like to know more about this. What is the difference between this and what I see in other desktops like Xfce etc and why some apps don't show an icon here when they should, while others do.

enter image description here

  • please comment when down-voting and i'll try fix what's wrong – user170 Mar 15 '16 at 10:31
  • Don't call elementary OS eOS. I have done the changes for you but take a look @ elementaryos.stackexchange.com/questions/850/… – Suici Doga Apr 13 '16 at 13:08
  • I have renamed eOS to elementary OS in all the posts I could (some contain eOS in uname output) – Suici Doga Apr 13 '16 at 13:14
  • @SuiciDoga - Why is this important? are there some rights involved? I personally would like to see eOS used for elementary, like one says MS for Microsoft, Mint or LM for Linux Mint etc – user170 Apr 13 '16 at 15:07
  • Did you read the link? – Suici Doga Apr 13 '16 at 15:51

That is a System Tray, and the answer you link to is somewhat contradictory.

elementary OS does not have a system tray
Currently (in 0.3 Freya), only the Ayatana Indicator API is respected.

Ayatana Indicators do exist in a system tray in Freya, however they will not in Loki.

  • I suggest you comment the linked answer and argue the OP to clarify. – user170 Mar 12 '16 at 21:00
  • I have appended an edit for clarification. – Lewis Goddard Mar 12 '16 at 21:03
  • This answer is not really accurate. System Tray is the actual user-facing name of the GtkStatusIcon API. The Ayatana Indicator API is never referred to as a "system tray". They are pretty different APIs in terms of the things they allow. – Daniel Foré Apr 13 '16 at 16:14