Simulation – Internet-based Simulation using Off-the-shelf Simulation Tools and HLA 2
•Four general solutions for integrating existing simulation tools into HLA
•Re-implementation of the tool with HLA extensions
•Extension of intermediate code
•Usage of an external programming interface
•Coupling via a gateway program
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This is the most obvious solution. If the source code of a tool is available and well documented, this is the most straightforward and probably the least complicated solution.

Some simulation tools translate model descriptions written in a tool-dependent modeling language into another programming language. This intermediate code is then compiled to an executable file. It is possible to modify this code to realize the HLA extensions.

This solution is well suited for tools that offer an open and extensible architecture. The tool should offer a library interface with the ability to call functions or methods in these libraries. Additionally, the tool should make it possible to implement callback functions or methods.

The last solution for tools which can not be connected to the RTI by any of the prior methods is the development of a gateway program. The gateway program could communicate with the simulation tool via appropriate means (files, pipes, network) depending on the capabilities of the simulation tool.
(Strassburger et. al., 1998)