What is the input "key" in the IMAQ Write Custom Data palette?

Hello!
I am not able to use correctly the IMAQ Write Custom Data palette because I do not know what is the input "key".
Does anyone know its meaning?
Sincerely,
Fábio Machado Cavalcanti
Canada-Brazil Science Without Borders Student
Lakehead University, Thunder Bay, Ontario, Canada
Federal University of Pernambuco (UFPE), Recife, PE, Brazil
Undergraduate Student in Chemical Engineering

Thank you for replying Ninad Regundwar!
I agree with this. I have already read this information in the LabView Help.
However, I would like to know what is the "key" specifically. I know that it is a string.
I have written a code to add some acquisition features in a PNG Image File. For this, I have used the following palettes: IMAQ Write File 2 - PNG with Vision Info and IMAQ Write Custom Data.
Afterwards, I have written another code to read the acquisition features from this PNG Image File. For this one, I have used the following palettes: IMAQ Read Image and Vision Information and IMAQ Read Custom Data.
But, when I am reading the acquisition features, an error message appears: "ERROR -1074395723 occurred at IMAQ Read Custom Data - IMAQ Vision: The key you specified cannot be found in the image"
I do not know what I have to put in the input "key". So, I have been trying different values for it: "data", "hello", "13", "56", etc. But, none of these has worked and the same message has appeared.
Does someone know what I have to put in the input "key"? Does someone have an example that shows how to use the palettes: "IMAQ Write Custom Data" and "IMAQ Read Custom Data" correctly?
Sincerely,
Fábio Machado Cavalcanti
Canada-Brazil Science Without Borders Student
Lakehead University, Thunder Bay, Ontario, Canada
Federal University of Pernambuco (UFPE), Recife, PE, Brazil
Undergraduate Student in Chemical Engineering

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