lucy24 - 8:17 pm on Jul 6, 2013 (gmt 0)
is it possible via .htaccess to block access to the WP login page for EVERYBODY if they don't arrive at that page via a link / redirect from another page?
Most of the time, yes. Use either mod_rewrite or mod_setenvif to look at the referer. But it doesn't help with the 2% of users who simply don't send a referer. It also won't help if you have individual human users who choose to bookmark the login page itself.