1. A system for enabling searches of content at a server, comprising: a server which is configured to receive queries from clients for content; a communication protocol which enables an asynchronous connection between the clients and the server, and allows each client to communicate, under control of a user and as part of a session, a plurality of consecutive query strings to query the server for content; and a query and result cache that stores one or more query strings previously communicated from the clients, or content results previously returned from the server; wherein each of the clients provides an input field, which allows the user to enter as an input a query comprised of a plurality of consecutive query strings, and wherein the client transmits to the server within the session a plurality of queries to retrieve content from the server matching or related to the plurality of consecutive query strings, wherein each of the plurality of queries form an increasingly lengthening query string for retrieving content from the server; and wherein the server receives the plurality of queries from the requesting client, and in response to receiving each of one or more additional characters in the increasingly lengthening query string as they are being entered at the input field, automatically matches the increasingly lengthening query string initially by matching the query string against the content of the query and result cache, and subsequently by matching the query string against other content available to the server, and asynchronously returns, while the increasingly lengthening query string is being entered by the user at the input field at the client, increasingly relevant content to the client.
1. A system for enabling searches of content at a server, comprising: a server which is configured to receive queries from clients for content; a communication protocol which enables an asynchronous connection between the clients and the server, and allows each client to communicate, under control of a user and as part of a session, a plurality of consecutive query strings to query the server for content; and a query and result cache that stores one or more query strings previously communicated from the clients, or content results previously returned from the server; wherein each of the clients provides an input field, which allows the user to enter as an input a query comprised of a plurality of consecutive query strings, and wherein the client transmits to the server within the session a plurality of queries to retrieve content from the server matching or related to the plurality of consecutive query strings, wherein each of the plurality of queries form an increasingly lengthening query string for retrieving content from the server; and wherein the server receives the plurality of queries from the requesting client, and in response to receiving each of one or more additional characters in the increasingly lengthening query string as they are being entered at the input field, automatically matches the increasingly lengthening query string initially by matching the query string against the content of the query and result cache, and subsequently by matching the query string against other content available to the server, and asynchronously returns, while the increasingly lengthening query string is being entered by the user at the input field at the client, increasingly relevant content to the client. 10. The system of claim 1 , wherein said client or a client software adds an additional qualifier value to the query strings that are passed to the server, and wherein the server can use said qualifier to execute the query on said content engines, and return appropriate results based on both each query string and the qualifier value.