Global Variable F3

[tsng]

How to use the Global Variable F3 in MT5?

[MetaQuotes]

Global variables in MetaTrader 5:

• User guide: https://www.metatrader5.com/en/terminal/help/algotrading/service_global
• MQL5: https://www.mql5.com/en/docs/globals
• Search: https://www.mql5.com/en/search#!keyword=global%20variable
  

[tsng]

MetaQuotes:

Global variables in MetaTrader 5:

• User guide: https://www.metatrader5.com/en/terminal/help/algotrading/service_global
• MQL5: https://www.mql5.com/en/docs/globals
• Search: https://www.mql5.com/en/search#!keyword=global%20variable
  

I read through the above 3 web sites. They only explain what global varibles mean but don't explain or don't provide any example how the global varibles work. For example

what are the gvar0  1.2, gvar1  1.7, gvar2  0.3? Where  will those gvars be applied to? How do they affect the MT5?