Below are some examples to explain services usage by using HTTP/GET and KVP encoding.
Basic WPS Requests | GetCapabilities DescribeProcess

Request | Description
--- | ---
GetCapabilities Retrieve capabilities information | ^ up
WPS 0.4.0 GetCapabilities | Retrieve capabilities information by using the URL http://localhost:8080/deegree-wps/services?REQUEST=GetCapabilities&version=0.4.0&service=WPS
DescribeProcess Describes defined processes | ^ up
WPS 0.4.0 DescribeProcess Buffer | A DescribeProcess request, which describes the Buffer process: .../services service=WPS version=0.4.0 request=DescribeProcess Identifier=Buffer