entry widget signal

I have a notebook page with many entry widgets, and after entering text into
all these entry widgets I use a button click event to use the contents of
all the entry boxes -- no problem.  However, I cannot see how to monitor the
text in an entry box as I enter the text so that I can do validity checks on
the data.  For example, I would like to check that I am entering 1 through
12 and when I enter 14 without hitting return key I would like to popup a
warning dialog.  Other that taking the entry widget and creating a new entry
widget that generates a new signal, I really do not know how to accomplish
this task.  Anyone have any ideas or suggestions?

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