Can we pass Parameters to a Task from External System while Redirection through URL

@neelimaj790 As per my Understanding, if i expose my Process Model as WebService then it will generate a new Task, but my requirement is if i already have one Task Open, i need to get the data on the same Task Page rather than having an extra Task. Let's assume, i am trying to perform a Transaction, in such cases the user is expecting to get the response on the same page rather than getting an another page an asking him to open that Page. So in my Application, i am triggering the Control from my Application to External application and on External System user is performing some operation and it's result is needed to return to the same Task page from where the request was sent. This is what my requirement was and still i am working on it.

@neelimaj790 As per my Understanding, if i expose my Process Model as WebService then it will generate a new Task, but my requirement is if i already have one Task Open, i need to get the data on the same Task Page rather than having an extra Task. Let's assume, i am trying to perform a Transaction, in such cases the user is expecting to get the response on the same page rather than getting an another page an asking him to open that Page. So in my Application, i am triggering the Control from my Application to External application and on External System user is performing some operation and it's result is needed to return to the same Task page from where the request was sent. This is what my requirement was and still i am working on it.