Hi Benita,
To answer your questions:
1) Q:
What do you means by updating service binaries?
A:
Service binaries = Your SOA service dll and its dependencies. They must exist on each compute node.
Updating means: in case you change your service code, you may want to update the dlls.
2) Q:
When frequently used files are shared; whether it will lead to traffic and time consuming then copied to local nodes?
A: yes, if frequently used files are shared, they'll lead to traffic. recommendation: copy to local nodes.
3) Q:
Whether we can run parallel task in a session or for each task a client has to initiate a session?
A: you cannot run parallel tasks in a session. but you can create a shared session.
then use multiple tasks, each task will create a client, the client then use this shared session.