Urgent:How to validate ticket using Alfresco Web Service API

[itsard]

Hi,
How do I validate ticket using Alfresco Web Service APIs.I can get a ticket after authenticating the user but how do I pass that ticket
to the subsequent api calls as those apis dont have ticket parameter as an argument.
The Rivet apis that I have checked have the ticket parameter as an argument. Is that an advantage of the Rivet api
over the web service api.
Also which of them are better…web service apis or rivet apis.

[itsard]

Can i directly call the validate() api on the ticket obtained after authentication in the Web Service API?
If yes, please let me know the code snippet for it.