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Are you referring to header as in the top of the page? This may already be a portlet, depending on the implementation. If you want to change something in the header, the easiest way is to make a custom portlet.
If you are referring to the "last connection time" and mean the time of last login, you may want to store that value after login as a user preference. This question has been asked in the past, you may want to search to see if you can find it.