Dear Krishna
topic of ALE has been discussed as well here. IN most cases it does not run like. data from prod to qual; but data from prod1 to prod 2. You need "just" to make sure that ALE is established between sender and receiver. In theory (nether tried it) you can do ALE between client X and client Y in the same SAP system.
PLease check SAP online help. YOu will find quite good information there
C.B.