Hi Harish,

From the Robotics course that is available in PDN academy found the below information,

Interactions and activities
An interaction is a customer contact through a phone call, a face-to-face meeting, or a received
document. Any of these things initiates the call to perform one or many activities to meet the need of the
customer.
The Interaction Framework provides the flexibility for a solution to manage one interaction or many
interactions simultaneously. The framework creates a data table to store the interaction context values.
An end user may have several interactions opened at the same time, but can work on only one
interaction at a time. Compare this situation to your computer desktop: you may have several
applications open and running at the same time, but you can work in only one of the applications at a
time.
Once an interaction starts in any project in the framework, all other projects in the framework can
complete work or activities for the interaction. Activities run with the same logic. Once an activity starts
in one framework project, the activity can complete in any framework project, including the one in which
it started.
You must start and stop interactions and activities so that the framework can communicate the success
or failure of the process across the projects.

Hope this information might be helpful.

Regards

Mahesh