By using non-blocking event-driven communication with a built-in thread-pooling mechanism, RealThinClient SDK can handle thousands of active connections by using a limited number of threads in a real multi-threaded environment (for example, 100 threads will be more than enough to handle several thousand active connections). Combined with reduced need for all important resources (CPU, Memory, Threads, Timers, Handles, etc), automatic handling of all communication-related objects, flexible remote functions (accept any structure for parameters and return any other structure as a result), automatic session handling (integrated time-out with variable life time) and a lot more, makes writing stable and fast Servers and Clients very easy with the RealThinClient SDK.

Write Firewall-friendly Clients, Servers and ISAPI Extensions (Apache and MS IIS compatible)
Write reliable HTTP-based Routers, Proxy Servers, reverse Proxy Servers and Load Balancers
When you need strong SSL/TLS encryption, you can either use 3rd-Party Encryption components as plug-ins for the RTC SDK (for example: StreamSec Tools 2.1 = 99 €), or you can use built-in SSL support with RTC Clients and compile your RTC Server code into ISAPI DLLs to run on third-party Web Servers which have SSL support (for example MS IIS, Apache or Abyss)
Debug ISAPI extensions using the RTC Web Server (full source code in Delphi included)
Component-based and Modular Design allows you to add new remoting functionality into your existing Delphi applications and re-use existing code
Make your Clients and/or Servers Multi-Threaded by setting a property (built-in thread-pooling)
Enable Auto-Compression and built-in Encryption simply by setting a property
Empower your "static" HTML pages by using the RTC Scripting Engine, building a bridge between your native Delphi code and your visual HTML presentation
One Server-side code can be compiled to a Stand-alone Server and ISAPI Extension
Flexible and very powerful RTC Remote Functions with integrated support for creating and maintaining Linked Objects, plus a fully customizable template-based Remote Functions Wizard.
Integrated XML-RPC support: write functions in Delphi and make them remotely accessible to a 3rd-party through XML-RPC; Easily call remote functions published by a 3rd-party in XML-RPC format.
Components and Demo Projects with full Source Code, ready for building cross-platform Applications with Delphi (Win32 with Delphi 6 - XE; Win32+Win64+MacOSX+iOS with RAD Studio / Delphi XE2) .

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http://www.realthinclient.com/about.htm

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