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URLhttps://www.avsim.com/forums/topic/583689-simconnect-could-someone-explain/
Last Crawled2026-01-14 19:05:09 (2 months ago)
First Indexed2020-09-20 08:34:22 (5 years ago)
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Meta TitleSimconnect - could someone explain? - Microsoft Flight Simulator (2020/2024) - The AVSIM Community
Meta DescriptionHi, whenever I look i see topics related to that mysterious (for me) Simconnect. I know this is a dll library that somehow connects MSFS with third-party addons. What I'd like to know is if this simconnect (recently fixed for stuttering issue, as I have read) needs to be downloaded & installe...
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23 minutes ago, Kenjiro75 said: One of the steps gives a link to download & install simconnect. If you say Simconnect is included with the sim, should I omit that step or download and install? SimConnect is the API, the "application programming interface" of MSFS. The older sims had a similar API with the same name, and these APIs are somewhat compatible. An API is not something that you install, it is part of the software itself. In this case, SimConnect is an integral part of MSFS, just like it was in FSX and is in P3D. The point of an API is to make communications possible for external programs, and to do that consistently the same way in every version of the software (otherwise everyone would have to rewrite their addons every time there is a new version of the base platform). A program that wants to access the API must be constructed using the API libraries that are provided by the manufacturer of the software. In case of our sims, if you want to write a program that talks to MSFS, you have to use the libraries provided by Asobo in the SDK. In the old days it was the same, you would compile your app with the libraries from the FSX SDK. The SimConnect API is backwards compatible, but not the other way around. So a program that was made for FSK SimConnect can talk to MSFS - but no program that was made for MSFS could talk to FSX. But the different SimConnect API versions over the years are not fully independent. In the early days, an extra client program was required, as an intermediate between your program and the SimConnect "server". That architecture made it possible to run the addon on a separate computer, because that client program handled all the communictations to the sim over the IP network (even when installed locally). Older software, that was built with the FSX SimConnect libraries, still requires this client program - and that is what you install. An up-to-date addon program, that was built with the current MSFS libraries, doesn't need any extra client. So if an installation manual says that you are supposed to install a SimConnect client, you know that this program has not been built to MSFS specification. That doesn't mean that it won't work, just that it is using old tech. It is the choice of the programmer if he updates his code or not. As long as people are prepared to install 14 year old client programs, everything is fine. Long story short - a program that is using an old version of the SimConnect libraries requires an extra SimConnect client program. You have to install that, or the addon won't work. Best regards
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