Explanation of icons, where?

[Alexander Volovics]

Hello,

The 'Processes' option of 'System Monitor' has a column for
'Session'. This shows some icons as entries for some processes
(for example 'gnome-keyring-daemon', 'gnome-panel', etc).

One with little dots(cirkels), another resembling a traffic stop sign,
etc. What is the meaning of these icons and where is this explained?
(I am talking about Fed 13).

Alexander