Interoperability Limitation
The HLA is an architectural standard establishing among other things an Application Programming Interface (API) between an application and the Run-Time Infrastructure (RTI). The RTI provides no standard for network transport which requires all participating applications to use the same RTI software for transport. The RTI network transport is specific to each RTI implementation which is purchased from vendors or obtained from other sources. In order for HLA to be deemed interoperable, any given HLA application must have the capability to connect to any other given HLA application without first having to procure a proprietary RTI package. In these situations, DIS is often pressed into service as a fallback solution to achieve interoperability. While there are open source and various government sponsored RTIs being used in HLA exercises, many mainstream RTIs are relatively expensive, costing several hundred dollars US or more per computer seat.
Read more about this topic: High-level Architecture (simulation)
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“Liberty has never come from the government. Liberty has always come from the subjects of the government. The history of government is a history of resistance. The history of liberty is the history of the limitation of government, not the increase of it.”
—Woodrow Wilson (1856–1924)