Depends. You can link to other POD documents by using L<DocumentName> but the POD translator needs to know how to turn that into a relative link. You can also create any HTML by using the =for html or =begin html statements:

=for html
<a href="relative/link.html">relative</a>

 or

=begin html

some <b>html</b>

=end html
[download]

update: also see perlpod