Is there a way to authenticate a user at a form level in Appian? I need this in one of my SAIL forms. Any suggestions/inputs would be greatly appreciated.

That depends on what "authentication" you need. For any particular interface, you can tell what user account is currently looking at it simply via the loggedinuser() function. For anything more advanced than this, I'm not sure what's possible (or even feasible) without use of some sort of plug-in.

That depends on what "authentication" you need. For any particular interface, you can tell what user account is currently looking at it simply via the loggedinuser() function. For anything more advanced than this, I'm not sure what's possible (or even feasible) without use of some sort of plug-in.