wcf feed one request at a time

hi,

i am using
[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single, ConcurrencyMode = ConcurrencyMode.Single)]  in my WCF code

i want  to know what will happen when 15 request send at a time to WCF Secrvice



thus the above code queue my 15 request  and feed the request one at a time