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Hi Adriana

a good point to start is Lightstreamer General Concepts
You'll find a good introduction on the general concepts behind Lightstreamer. It will clarify many of your doubts.

As before itemName should be a literal string, so somethink like "MyItemName", or a variable: in this case you should have done before something like:
var itenName = "MyItemName"

if the error is still "Error: Cannot find module 'lightstreamer-adapter'", it means it is not able to properly install the adapter.
try to uninstall the adapter, clear the cache and reinstall it.
...

Hi Adriana,

if you have installed the windows version of node.js, try to run 'npm install lightstreamer-adapter' from a windows command instead of from a cygwin shell.

Hi Adriana,

actually, if it's a literal string, you should write the address between quotes: so "localhost" instead of localhost, otherwise it is interpreted as a variable.

Hi Adriana,

First of all you should verify if the server is correctly configured, in particular see point 4 of section "Configure Lightstreamer", and if it is properly running: so, take a look at...