what is "SetLevelValue"

[selnomeria]

hi, 

can someone tell me what does this function?

https://docs.mql4.com/customind/setlevelvalue

i have

SetLevelValue(0, 50);
SetLevelValue(1, 68);
SetLevelValue(2, 32);

and get such image:

i cant understand how they act...

[William Roeder]

They're for separate window indicators, not on chart ones.