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Docs/Samples/indicator_buffers.md

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+# Buffers
+
+simply they are arrays which store information for using them as series in candles ...
+in each mql program you had to define which buffers youi have to use in your program.
+
+this happens by the following pattern
+
+```mq4
+#property indicator_buffers numOfBuffers
+```
+
+for example:
+
+```mq4
+#property indicator_buffers 2
+```
+here we define 2 buffer to system for processing in each candle ...
+
+then we have to define arrays ...
+
+double BufferFast[];
+double BufferSlow[];
+
+usually for each indicator buffers we can define a constant to hold it's index on chart queue.
+
+```mq4
+#define FastIndicator 0
+#define SlowIndicator 1
+```
+
+each buffer holds data to use in candle calculation time and then draw things on chart.
+
+we have to define Indexes for Buffers to draw themon chart.
+this happens on OnInit() event handler method.
+
+```mq4
+int OnInit() {
+    //
+    // Fast Indicator ...
+    SetIndexStyle(FastIndicator, DRAW_LINE, STYLE_DOT, 1, clrFireBrick);
+    SetIndexBuffer(FastIndicator, BufferFast);
+    SetIndexLabel(FastIndicator, "Fast");
+ 
+    //
+    // Slow Indicator ...
+    SetIndexStyle(SlowIndicator, DRAW_LINE, STYLE_DOT, 1, clrGreen);
+    SetIndexBuffer(SlowIndicator, BufferSlow);
+    SetIndexLabel(SlowIndicator, "Slow");
+
+    //
+    return INIT_SUCCEEDED;
+}
+```