Histograms/Density/Quantile plots

[Santosh <santosh2005@gmail.com>]

Hi R/S+ians
Good Morning...

I was wondering if there is a way to plot the following in one plot:
1     histogram of dichotomous distribution of data with bars next to each other; colors may be used to distinguish categories.
2     overlay the histogram with density and quantile lines of categorical data
3     Customize the x and y-axes as:

• x - ticks display breaks applicable to the dichotomous bars as value instead of %s, so that the bars in each break/class are positioned on or around that value; x-label takes the column name of the variable
  
• y axis and ticks are applicable for both density lines and bars; number of density lines  =  number of categories
  

c) Add legends for  bars and lines

In addition, I would highly appreciate your inputs for the following:
1) How is "width" calculated when using barplot(x, ...,beside=T, plot=T or plot=F)
2) What functions are used to calculate density (as mentioned above?

Thanks much in advance
Santosh