From the Crimson user manual:
To embed tag data within a web page, insert the sequence [[N]], replacing N with the index
number of the tag in question. This index number is displayed on the status bar when a tag is
selected within the Data Tag window, and more-or-less corresponds to the order in which the
tags were created. When the web page containing this sequence is served, the sequence will
be replaced by the current value of the tag, formatted according to the tag’s properties.