From Divinity Engine Wiki
- call SetVarString((GUIDSTRING)_Source, (STRING)_VarName, (STRING)_VarValue)
Sets the value of the variable %<_Varname> to _VarValue, if the variable exists and is of the FIXEDSTRING type.
- The variable has to be global. The _Varname does not include the prefix % that is used for global variables in behaviourscript. E.g. a variable that is called %Variable in behaviourscript would simply be Variable for the purposes of this call.