Refresh Expired Links :

One of the unique features found in PDM is its refresh expired links feature. When you download a file from certain sites they create a session for file downloads. If your internet connectivity is problematic then this feature will request you to refresh the link address if you try to download the same file from the start since the file won’t be available in the old link.

Pocket Download Manager

PDM by Tonec Inc   is a power-packed download manager / accelerator that has a user-friendly interface and is bloatware-free. It can also increase download speeds by splitting a file into many segments which are then moved in parallel. It seamlessly integrates into popular browsers such as Firefox, Chrome, Internet Explorer, Opera, Safari etc. PDM also supports multiple protocols such as  HTTP, HTTPS, MMS, FTP and plain RTMP 

Web server accelerator

Other web accelerators are targeted at the web site or web application owners. This type of web accelerator is installed in front of web servers and application servers and use a variety of the above techniques to improve performance to all users accessing the accelerated web sites or web applications. Sometimes referred to as a Reverse proxy.
These type of server side accelerators has the added benefit of off-loading transactions and connection managements from the web or applications servers and hence, reducing its CPU utilisation and increasing web server or application scalability to handle more users with less bandwidth.

Client–server

There may be two sections to the proxy as well - a server portion sits in front of the Web server and captures the input and output from the server and a client portion sits in front of the end-users Web Browser to capture the input and output from the browser.

Web client accelerator

As of July 2006, these applications generally serve to improve dial-up, broadband and other connections from which users may not be getting the best speed. Many users can achieve a 2- to 10-times speed increase in average browsing experience, while some report a 5- to 20-times speed increases for specific web sites and pages. Many ISPs offer web accelerators as a part of their dial up and broadband services. Web accelerators are typically designed for web browsing and, sometimes, for e-mailing and can not improve speeds of streaming, gaming, P2P downloads or many other Internet applications. However, there is substantial work being done on client-side Web Accelerators for Application Delivery Networks by several companies including Cisco Systems and F5 Networks as the demand for SaaS and PaaS look set to grow among SMEs.

Techniques

Web accelerators may use several techniques to achieve this reduction:
They may cache recently or frequently accessed documents so they may be sent to the client with less latency or at a faster transfer rate than the remote server could.
They may freshen objects in the cache ensuring that frequently accessed content is readily available for display.
They may preemptively resolve hostnames present in a document (HTML or Javascript) in order to reduce latency.
They may prefetch documents that are likely to be accessed in the near future.
They may compress documents to a smaller size, for example by reducing the quality of images or by sending only what's changed since the document was last requested.
They may optimize the code from certain documents (such as HTML or Javascript).
They may filter out ads and other undesirable objects so they are not sent to the client at all.
They may maintain persistent TCP connections between the client and the proxy server.
They may improve the performance via protocol level accelerations, such as TCP acceleration.

Features

Features

PDM allows users to automatically download any file types, divides downloads into multiple streams for faster downloading, batch downloading, Import and Export of download jobs, auto/manual update of download address, supports multiple queues and lists recent downloads for easy access to files. It can search for mirrors in order to increase download speeds and also supports downloading videos from many streaming video sites. The PDM algorithm includes dynamic segmentation throughout the downloading process. PDM supports HTTP, FTP, HTTPS and MMS protocols, Microsoft ISA and FTP proxy servers and authentication protocols like Basic, Negotiate, NTLM, and Kerberos allowing for storage and auto-authentication of user names and passwords.
The software ships in two versions. One is a free, 30-day trial (some versions are a 15-day trial). The application stops functioning at the end of the trial period unless a license is purchased. The other version is commercial for continual use. PDM works with Internet Explorer, Opera, Netscape Navigator, Apple Safari, Flock, Google Chrome, Mozilla, and Mozilla Firefox.