If the variable does not exist, the system creates a new global variable. As a practical example i consider a case when global variables are used as control points for implementation of program stages. A new row is added to the table, where you can specify the name of the variable and its value
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To edit created global variables, double click on the appropriate cell.
The global variables for mt4/mt5 are stored for 4 weeks from the last access to mt4/mt5
Note that they will be deleted after 4 weeks of no access Here we will look at how to set global variables on mt4/mt5 Switch between mt4/mt5 tabs to check the steps for each. There is a group set of functions for working with global variables
Global variables of the client terminal are accessible simultaneously from all mql5 programs launched in the client terminal. The variable time attribute value is changed only when accessing it, i.e No other functions can change the variable time value when using the globalvariableset () and globalvariableget () functions. An access to a global variable is not only setting of a new value, but reading of the global variable value, as well
Writing and reading global variables the mql5 api provides 2 functions to write and read global variables
Globalvariableset and globalvariableget (in two versions). Global variables are accessible from all functions defined in the program They are initialized to zero unless another initial value is explicitly defined A global variable can be initialized only by a constant or constant expression that corresponds to its type.
