The 4D Language Reference for the PROCESS HTML TAGS command states:

"All the HTML tags of 4D are supported (4DVAR, 4DSCRIPT, 4DLOOP, etc.), regardless of the Web server operating mode (contextual or non-contextual) — and even when it is not started."

https://www.4d.com/docs/CMU/CMU00816.HTM

However, you may not be aware that the On Web Authentication database method may be called by PROCESS HTML TAGS, even if the Web server is not running. It is important to take this into account when designing your On Web Authentication database method since this method must return true in order to, for example, execute methods referenced by #4DSCRIPT tags in your HTML.

For the rules under which On Web Authentication may be called, see the section titled "On Web Authentication Database Method calls" at:

https://www.4d.com/docs/CMU/CMU02055.HTM