[PLUG] Entering extended characters in Linux

[Art Alexion <art.alexion@verizon.net>]

This came up when I answered a question from a windows user at work.  In 
windows when I want to enter extended characters (e.g. "em-dash"), I hold 
down alt while typing the ascii code on the numpad (alt+0151).  This doesn't 
seem to work in Linux.  Is there a Linux equivalent?

I have compose_key set up at home but can't seem to get it to work at the 
office.  I hate using gui grids for stuff I like to use all the time like, é 
and §.
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Art Alexion

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