SOAP adapter

hi experts.....

What is the meaning of encoded headers in sender SOAP adapters? i.e. headers to be encoded? What is encodeing? What is the difference between keep headers and encoded headers?

If we mention QoS as EOIO? How we will use this and how to mention queure name where we will define this queue name?

In receiver SOAP adapter what is the queue string? How and where we will define this queue string? What is SOAP default action?

thanks in advance