How to do async multi call

Remoting SDK
1

Dear All,
When l use the async function from client side, how can I create multiple call for same function.
Like:
button 1 click to:
fAsyncService1.Invoke_calSum(StrToInt(edit4.Text), StrToInt(Edit5.Text));
button 2 click to :
fAsyncService1.Invoke_calSum(StrToInt(edit4.Text), StrToInt(Edit5.Text));
but if I click button 1 and button 2 , fAsyncService2.AnswerReceived is always be true.
when I click button1 only it runs well.
could you please let me know what 's the correct way to do that? cause I want to call same function on different forms of client side.

2

see at AsyncEx interface. it allows to specify personal callback function for each request.

the Phone Photo Server sample demonstrates usage of AsyncEx interface