how to maintain EOD indicator in Intraday?

#1
Dear seniors,
I'm a new bie for TA and Amibroker.I've some basic doubts so please help me on the following:

Suppose I plan to buy a stock when close on Eod chart crosses tha ma(close,15) and to sell it when MA(Close,15) crosses the close.

Now on day when i found that the close has crossed its MA(close,15) i buy it on next market open.
But on that day during the session how will i know that now prices has gone below the MA(close,15) and its time to exit.
Thanks in advance.
 

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