What is Despatcher and work process

Dear Friends,
Pelase let me know what is Despatcher and Work Process and how this Working.
Thanks in advance,
Regards,
JD

see very basic explanation of sap dispatcher
http://www.saptechies.com/what-is-sap-dispatcher-what-are-the-functions-of-dispatcher/
http://sapbrainsonline.com/FAQs/TECHNICAL/SAP_ABAP_ARCHITECTURE_FAQ.html
For more detailed info, you can refer WAS books from SAP.

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