The topic is about changing the account, isn't it. You turned the topic to changing timeframes, and in fact nobody complains about changing timeframes. Now, you are talking about recalculating bars. Do you really believe that recalculating more bars is the remedy for a changed account? When you start the indicator in a demo account, and then the indicator does not register that it has switched to a real account? When the indicator does not notice, that the history folder changed and keeps feeding hst file in an incorrect folder? When your indicator feeds a remote connection and does not notice the account changed? There are a dozen more reasons why you need to register the account change. The question was HOW to register the ACCOUNT CHANGE in an INDICATOR, not quarrelling about global variables in experts or recounting bars. Please accept it.