It should return the contents of the page as an array of one or more items to print. This optional parameter points to a reference to the subroutine responsible for drawing the last page of the series. This optional parameter indicates the content type of each page. Currently, server push of heterogeneous document types is not supported. This indicates the delay, in seconds, between frames.
Smaller delays refresh the page faster.
Fractional values are allowed. Users of other servers should see their documentation for help. This is a new module. It hasn't been extensively tested. You may modify this module as you wish, but if you redistribute a modified version, please attach a note listing the modifications you have made.