Read content of another application (chat application) in c#

I have a third party chat application where user will chat using this application.
 
We have one more application which was developed in C# and which provides details of account by providing the account number.
 
My requirement is need to read the contents from third party chat application and open the account details of entered account number in the Chat.
 
Is this feasible? How we can implement this

Please share your ideas on this.