how to terminate first AlertPanel when second AlertPanel appears

Hi All,

I am developing one application in that i want to add device request feature ,for that i am sending a message like "DeviceRequest" .
if this message is send to other pc in that pc it shows one Alert message (NSRunAlertPanel(@"Request",@"Please Disconnect the device",@"ok",@"",nil);
But again i am sending a devicerequest ,at that time first message will display like that only untill i click on Ok button.
my question is i want to terminate the first message when second message appears.
Is there any special window or any function is there.
please can anyone reply for my question?



Regards,
kiran