Synchronous conferencing and instant messaging are typical examples of push services. Chat messages and sometimes files are pushed to the user as soon as they are received by the messaging service. Both decentralised peer-to-peer programs (such as WASTE) and centralised programs (such as IRC or Jabber) allow pushing files, this means the sender initiates the data transfer rather than the recipient.
Email is also a push system: the SMTP protocol on which it is based is a push protocol (see Push e-mail). However, the last step—from mail server to desktop computer—typically uses a pull protocol like POP3 or IMAP. Modern e-mail clients make this step seem instantaneous by repeatedly polling the mail server, frequently checking it for new mail. The IMAP protocol includes the IDLE command, which allows the server to tell the client when new messages arrive. The original BlackBerry was the first popular example of push technology in a wireless context.
Another popular type of Internet push technology was PointCast Network, which gained popularity in the 1990s. It delivered news and stockmarket data. Both Netscape and Microsoft integrated it into their software at the height of the browser wars, but it later faded away and was replaced in the 2000s with RSS (a pull technology).
Other uses are push enabled web applications including market data distribution (stock tickers), online chat/messaging systems (webchat), auctions, online betting and gaming, sport results, monitoring consoles and sensor network monitoring.
multipart/x-mixed-replacewas added, which Netscape 1.1 and subsequent web browsers would interpret as a document changing whenever the server felt like pushing a new version to the client. It is still supported by Mozilla Firefox, Opera and Safari today, but traditionally ignored by Microsoft. It can be applied to HTML documents, but also for streaming images in webcam applications.
The WHATWG is drafting a Web Applications 1.0 specification which pushes content to the client. On September 1st, 2006, the Opera web browser implemented this new experimental technology in a feature called "Server-Sent Events.
In one such mechanism the web server does not terminate the response to the client after data has been served. This differs from the typical  cycle in which the response is closed immediately following data transmission.
The web server leaves the response open such that if an event is received, it can immediately be sent to the client. Otherwise the data would have to be queued until the client's next request is made to the web server. The act of repeatedly queing and re-requesting information is known as a Polling mechanism.
Long polling is itself not a push technology, but can be used under circumstances where a real push is not possible.
Microsoft Moves toward Compatibility with Netscape Push Technology.(Originated from San Jose Mercury News, Calif.)
Jun 06, 1997; Jun. 6--Microsoft Corp. has made a surprising move toward technological compatibility with archrival Netscape Communications...
Pushing software limits. (push technology helps IS managers distribute software updates across network) (Technology Information)
Jun 01, 1997; Businesses are eyeing push technology to handle the age-old problem of getting software updates to user desktops. Distributing...
Meet the newest buzzword: 'push' technology.(Internet software automatically sends data from World Wide server to end-users)
May 12, 1997; When it come to the Internet and content availability the newest bussword is "push technology". While it has not yet made any...