Learning the internals of BPEL engine

I want to understand how the bpel engine handles a request. More specifically, from the time it gets a request to the time it instantiate the correct bpel process, what are the steps involved. Where can I find some documentation on this. I looked at the BPEL dev guide (10.1.3.1) and admin guide...but this info does not seems to be there...any pointers

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    Lucky , today
    I find it after try to search in EM.
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    Click the properties attribute , then goes to a tableview, you will see all properties you set in design time. you will be able to change as well.
    Cheers
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    With Ajay Kumar and Telmo Pereira 
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    Hello Krzysztof,
    Another set of good/interesting questions posted. Thanks! 
    I will try to clarify your doubts.
    In the output below both resources (proxy-connections and ssl-connections rate) are configured with a min percentage of resources (column Min), while 'Max' is set to equal to the min.
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      ssl-connections rate          0        626        626        626      23204
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    ssl-connections rate should be read in the same manner, however all values for this resource are in bytes/s, except for Denied counter, that is simply the amount of packets that were dropped due to exceeding this resource. 
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    http://www.cisco.com/en/US/docs/interfaces_modules/services_modules/ace/v3.00_A2/configuration/virtualization/guide/config.html#wp1008224
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    To give more context, seeing resets with SSL connections is not necessarily synonym of drops. As it is usual to see them during normal transactions.
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    As ACE doesn't respond back, client would simply retransmit, and if he is lucky maybe in the next attempt he will be able to establish the connection.
    To overcome the denies, you will definitely have to increase the resource allocation. This of course, assuming you are not reaching any physical limit of the box.
    As mentioned setting max as unlimited might work for you, assuming there are a lot of unused resources on the box.
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    Telmo

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    The primary purpose of BPMN spec is meant to have a standard visual notation for business process diagram that can be understood by both business users and IT users. and in my view, the purpose of XPDL now is primarily used to be a standard serialization (interchange) format for exchanging BPMN models. BPMN does have all properties needed for generating executable BPEL. But BPMN is a visual graphic flow language and is more expressible than BPEL - not all BPMN flows can be expressed in BPEL and the mapping is non trivial. Having an XML execution language using BPMN seems too much and would cause serious problems in terms of portablity.
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