[Sman545]

I personally have no idea how to use the portable version. However, I will give you the simple run for the normal version:
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For single player maps: <!-- m --><a class="postlink" href="http://hce.halomaps.org/index.cfm?nid=386">http://hce.halomaps.org/index.cfm?nid=386</a><!-- m -->
I'm pretty sure the portable version for Custom edition can run custom maps. However I am not so sure of the portable version for Combat Evolved. So good luck. :P