strategy script with equity-curve (TS6)

hello,
I wonder know how introducing some parameters of the equity curve in a strategy (EL) in TS6.
For exemple , i can't write " I_OpenEquity" or "I_ClosedEquity" in an EL script of a strategy, because these words are reserved for plotted indicators. is there some similar terms which are accepted by EL in a strategy?
 
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