Will a message be consumed multiple times?

Hello all:
I guess this question was asked before, for that I apologize, but I did a search and found nothing so far.
I am actually using solace as the message broker in my project. When a response is published on a topic, there are several waiting client instances listening to that topic. Are these consumers competing for whatever message published on this topic? Say, if instance#1 get the message first but this is not what it wants, will this message get lost in a black hole, or other instances still have a chance to get hold of it?
I guess this is a common scenario, so sorry for the naive question.
Thanks,
John

sorry for the late response.
As I metioned I use solace systems, (http://www.solacesystems.com), I should have looked for a more relevant forum but unfortunately I couldn't find one.
I noticed something new in my latest tests, this is what I did:
- start the server;
- start the client;
- client sends request to run a stored proc;
- server runs the stored proc and sends 16 packages back to solace;
- first time, client receives all 16 pkgs;
- the same client sends the same request again, the 2nd time and the following attempts get fewer packages;
- the server log shows all packages are still emitted each time.
When the client sends the request, it publishes it to a topic. When the server sends back, it directly "reply" to the client.
I am quite puzzled that how come some packages could even get lost.
Could it be that the server sends the packages faster than the client can consume therefore some get lost? But in the 1st time of receiving all packages were received.
Thanks for your thoughts,
John

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Edited by: bhavani prasad kotharu on Aug 6, 2009 3:09 PM

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DATA :    lwa_bapimepoheader TYPE bapimepoheader
         ,lwa_bapimepoheaderx TYPE bapimepoheaderx
         ,li_bapimepoitem TYPE STANDARD TABLE OF bapimepoitem
         ,lwa_bapimepoitem TYPE bapimepoitem
         ,li_bapimepoitemx TYPE STANDARD TABLE OF bapimepoitemx
         ,lwa_bapimepoitemx TYPE bapimepoitemx
         ,li_conditions TYPE STANDARD TABLE OF komv
         ,li_return TYPE STANDARD TABLE OF bapiret2
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PARAMETERS: p1 TYPE c AS CHECKBOX.
IF p1 = 'X'.
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lwa_bapimepoheader-purch_org = 'NA00'.
lwa_bapimepoheader-pur_group = 'C02'.
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lwa_bapimepoitemx-po_itemx = 'X'.
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lwa_bapimepoitemx-agreement = 'X'.
lwa_bapimepoitemx-agmt_item = 'X'.
lwa_bapimepoitemx-pricedate = 'X'.
lwa_bapimepoitemx-price_date = 'X'.
lwa_bapimepoitemx-preq_no = 'X'.
lwa_bapimepoitemx-preq_item = 'X'.
lwa_bapimepoitemx-no_rounding = 'X'.
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         conditions = li_conditions.
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