At present, I find that each quote server symbol is different and it is extremely difficult to keep track of it just in case I want to change the quote server for various reasons. For example, I generally use bloomberg for quote and history, but I find bloomberg is not providing historical data beyond last 3 or 5 years, whereas yahoo historical quote server provides it. So, If I want to download beyond 5 years of data, I have to select the yahoo historical quote server and have to change the symbol for the stock since bloomberg and yahoo does not have the same symbol for the same stock.
Please consider