Objects and Shared memory

Hi Folks,

So I can put a class object into shared memory like the create email class
cl_bcs.

I'm trying to find out what happens if I have 100 people try and access the methods of this single class instance
now in memory?

I have 100 programs calling the object, it is not getting locked because I'm not reading, changing or updating data. I have one copy of the class to
generate email. What kind of problems am I likely to have since there is no locking and no instantiating of a "unique" object? Will user
destinations or email attachments be over written?

Thanks

Bruce