This EA alerts you the Depth per inch of your monitor. This is very important code for this trying to make your panels work on multiple screen resolution.
Generally a panel works only for few resolutions with default steins. However a panel must work for all monitor resolutions.
In order to achieve this one must use DPI and set the dimensions of the panel according to DPI.
The code along with helps you achieve the same.
This code is used to create static object on MT4 charts which will not move along with the chart when you scroll the chart.Indicator Name
it gives you the name of the indicator which is attached to a chart.