plotting - How to show legend in a combined plot of many lists,

I am having trouble with adding a legend to a plot. The example I discuss here is simpler than my real problem, but describes it well.

I have a vector, called X with dimensions (100 x 6). I use the command ListPlot to plot one row of X at a time:

plotX={};
Do[
p1=ListPlot[X[[i]]];
AppendTo[plotX,p1],
{i,1,Length[X]}];

Therefore, the list plotX contains six list plots with 100 points each. To show all the plots, I use the command Show

Show[plotX]

Now I want to create a legend for this graph, for example {"x1","x2","x3","x4","x5","x6"}. How can I do this?

Thanks

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