Control page setup options in Delphi without showing Page Setup dialog

In my Delphi application, I can use the following code to show the Page Setup dialog to my users before printing.

//WebHTML is a TWebBrowser with a Document loaded.
WebHTML.ExecWB(OLECMDID_PRINT, OLECMDEXECOPT_PROMPTUSER);

Is it possible to change these page setup options using code (without showing the Page Setup dialog to my users)? I specifically want to control the Header and Footer options so that all users will have the same headers and footers.

The page setup settings are saved and loaded using Windows Registry keys. I wrote code to change the keys at the location "Computer\HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\PageSetup".