Checkout the Quick Start Guide for a general overview of the technology.
In order to use the NED and NED you can take a look at this example:
cat some_file.txt | \ curl -F 'input=<-' "http://opener.olery.com/language-identifier" | \ curl -F 'input=<-' "http://opener.olery.com/tokenizer" | \ curl -F 'input=<-' "http://opener.olery.com/pos-tagger" | \ curl -F 'input=<-' "http://opener.olery.com/constituent-parser" | \ curl -F 'input=<-' "http://opener.olery.com/ner" | \ curl -F 'input=<-' "http://opener.olery.com/ned" | \ curl -F 'input=<-' "http://opener.olery.com/property-tagger" | \ curl -F 'input=<-' "http://opener.olery.com/polarity-tagger"