Checks if the current user is logged in.
Returns TRUE if the user has logged in.
Returns FALSE if the user has not logged in.
Checks whether the user is logged in and has an e-mail address before performing a function.
<@dynamichtml subscription_action_script@> function allowSubscription(form) {<$if IsLoggedIn$> <$if IsUserEmailPresent$> <$else$> …} <@end@>