# Real-Time Telemetry
When using DCS World, X-Plane, Microsoft Flight Simulator, Falcon BMS, or the public protocol, you can connect Tacview to your simulator in real-time. Here are instructions for each simulator.
### With DCS World, X-Plane, or Microsoft Flight Simulator
#### On the Same Computer
* Start flying in your favorite flight simulator
* Open Tacview
* Go to `Recording -> Real-Time Telemetry`, enter `localhost` as your address, and `Connect`.
* You should start seeing your flight in Tacview immediately
#### On Two Different Local Computers
* Ensure the port 42674 (or your chosen port) is open on your firewall
* Start flying in your favorite simulator on Computer # 1.
* Make sure you know the Local IP Address of this computer – open a command prompt and type `ipconfig` to find it.
* Open Tacview on computer #2
* Go to `Recording -> Real-Time Telemetry`, enter the Local IP Address of computer #1 and click Connect.
#### On Two Computers on Different Networks
* Make sure the port 42674 (or your chosen port) is properly redirected on the router of the computer which is hosting the flight session.
* The host must advise the client of the host's public IP address (the host can find his public IP address on Google or other sites such as ) and Tacview Host Telemetry Password if applicable. Leave password field blank if no password is desired.
* The host starts flying in their favourite simulator
* The client opens Tacview and goes to `Recording -> Real-Time Telemetry`, enters the Public IP Address of the host, along with port and password as applicable, and clicks `Connect`.
### Real-Time Telemetry with Falcon BMS
For Real-Time Telemetry with Falcon BMS, see the [Falcon BMS User Guide](https://github.com/RaiaSoftwareInc/tacview.documentation/blob/main/falcon-bms.md)
### Real-Time Telemetry via the Public Protocol
With Tacview Advanced and above, you can stream telemetry data in real-time using the public protocol described in this [documentation](/tacview/technical-documentation/real-time-telemetry-public-protocol.md).
The password must be a crc64 of the UTF-16 text password (not UTF-8).
The crc64 is well documented on the internet, but here is some [c++ source code](https://ln5.sync.com/dl/8f8cd8f70/th8uqueu-6prad3iz-astnm6xb-jpuby4n2) to calculate it.
For example, for the password `L"test"` the corresponding crc64 will be `0x38e095a027baf2bc`
Please note that when Tacview tries to connect to real time telemetry, it uses the official 64-bit CRC hash first for the password. If this fails, it retries with a 32-bit CRC hash. This is because DCS2ACMI is still using 32-bit CRC hash, and Tacview must compensate for that. Anyone writing their own exporter must use 64-bit CRC hash.
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