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SharePoint-based Web sites can be password-protected to restrict access to registered users, who
are invited to join via e-mail. In addition, the site administrator can restrict certain members' roles
by assigning different permission levels to view post and edit.

Web services allow access to software through standard web protocols such as HTTP and SMTP. They enable software to interact with a wider range of clients. Web services can be consumed by any application that understands how to parse an XML. XML is the key technology used in web services. Microsoft .net web services support three protocols HTTP GET, HTTP POST and SOAP (Simple Object Access Protocol). For the clients to interact with the web services there must be a description of the method calls or interface that the web service supports. This web service description document is found in the XML schema called as WSDL (Web services description language). Any WSDL capable SOAP client can use the WSDL file to get a description of the web service and invoke methods on the service.

Web services allow access to software through standard web protocols such as HTTP and SMTP. They enable software to interact with a wider range of clients. Web services can be consumed by any application that understands how to parse an XML. XML is the key technology used in web services.Microsoft .net web services support three protocols HTTP GET, HTTP POST and SOAP (Simple Object Access Protocol).For the clients to interact with the web services there must be a description of the method calls or interface that the web service supports. This web service description document is found in the XML schema called as WSDL (Web services description language).

Both HTTP GET and HTTP POST use HTTP (Hyper Text Transfer Protocol) as the underlying protocol. The GET and POST methods have been widely in Servlets, CGI, ASP, and many more. Both of these methods encode the request parameters as name value pairs in the HTTP request. The GET method creates a query string and appends it to the script's URL on the server that handles the request. For the POST method the values are passed in the body of the HTTP request message.

Parses a query string and builds a hash table of key-value pairs, where the values are arrays of strings. The query string should have the form of a string packaged by the GET or POST method. (For example, it should have its key-value pairs delimited by ampersands (&) and its keys separated from its values by equal signs (=).)
Note:
public static Hash table parseQueryString(String s)

a) DoGet () method is used to get information, while doPost ( ) method is used for posting information.
b) DoGet () requests can't send large amount of information and is limited to 240-255 characters. However, doPost ( ) requests passes all of its data, of unlimited length.
c) A doGet ( ) request is appended to the request URL in a query string and this allows the exchange is visible to the client, whereas a doPost () request passes directly over the socket connection as part of its HTTP request body and the exchange are invisible to the client.

A single servlet can be called from different HTML pages, so different method calls can be possible.

A class invariant is a condition that defines all valid states for an object. It is a logical condition to ensure the correct working of a class. Class invariants must hold when an object is created, and they must be preserved under all operations of the class. In particular all class invariants are both preconditions and post-conditions for all operations or member functions of the class.