John,
Look into Pro/Web.Link (javascript) or Pro/J-Link (java) for programming
applications that interact with Pro/Engineer via the embedded browser.
You can find the help files for these in the Pro/E loadpoint/weblink or
loadpoint/jlink respectively. To get these interfaces (and the
mentioned folders) you do have to check the appropriate options in the
installer but there is no extra license required.
Best wishes,
Kevin
Kevin Schoonover
PTC Channel Technical Manager
Western North America