SOAP Adapter and plain HTTP

Hello,

what does the option

"Do not use SOAP envelope" on a SOAP SENDER adapter mean?

Does this mean, that only the payload from the soap message is sent to the integration server? (without the soap envelope)

Or does this mean, that I can send a XML message without SOAP envelope to the adapter from a HTTP client?

Which means, I can use the SOAP adapter like the standard PLAIN HTTP adapter, but I can implement a adapter module!

How knows more details on that?

Best regards

Werner Magerl