require 'rubygems'
gem 'soap4r'
require 'soap/soap'
require 'defaultDriver'
require 'client_auth_header_handler'

d = Soap.new
d.wiredump_dev = STDOUT

h = ClientAuthHeaderHandler.new          # Create a new handler

l = d.login(:username => your_username, :password => your_password + security_token)

d.endpoint_url = l.result.serverUrl         # Change the endpoint to what login tells us it should be
h.sessionid = l.result.sessionId              # Tell the header handler what the session id is
d.headerhandler << h                          # Add the header handler to the Array of headerhandlers

d.getUserInfo("")                                 # Make an API call; the empty String appears to be necessary