This command is included for backwards compatibility. The easier way to perform addition is via the normal variable assignment:
When using the #ADD command, do not specify the @ character at the beginning of the variable name.
The value is added to the current value of the variable varname. If value is not numeric, an error occurs. The value can also be a reference to another variable, adding its current value to the value of the listed variable. To subtract a value, use a negative value.
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