Indicators getting values from Indicators

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If this has been answered somewhere else, please post a link.

I'm looking to create an Indicator that will pop up a messgage box when some conditions are met. The conditions are already plotted on the chart via some other indicators. Is it possible to pull this data from the other indicators into this new indicator I am wanting to write?

Thanks in Advance!

PS.  Forgot to add, I'm not looking for someone to code this for me.  All I'm looking for is how to pull in the values from other indicators into this one.  I want to code this myself.
 
iCustom ?
 
Not quite sure what you mean by iCustom?  Can you be a little more detailed?
 
iCustom(....) function is used to get values of other indicator. see MetaEditer's help.

you want code youself ,but you do not know what supplied by MQL4 and MT lib. how to do?
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