OLPC Human Interface Guidelines/Activities/Activity Basics
Activities appear in the Actions section of the frame; starting
an activity amounts to creating an active instance of it,
represented in the activity ring. They can be started with a
single click. An activity may also be directly manipulated;
dragging an activity into the ring will also create a new active
instance of it. Visual cues differentiate between instances of
an activity and the activity icon in the frame. Specifically,
any activity installed on the system and appearing in the
Actions edge is drawn as a white outline stroke, with no fill.
Upon instantiation the icon receives a fill; both stroke and
fill colors match the XO colors of the child who created it.
Newly created activity instances inherit the scope of the view
in which they are created. This means that any activity started
from the Home view begins as a private one by default. Children
may later share private activities, opening them up to friends,
classmates, group members, or anyo