fill is the new PROCESS
[% fill site/header.tt3 %] --EOF--look inside...
Thus Spake Andy:
fill is the new name for PROCESS. It's shorter, quieter, and
more evocative of what we're actually doing - filling a template. We called
these directives in TT2. In TT3 they're commands (although the name
doesn't affect how they work, of course).