Hello, I am confused which pen protocol the HP ELITE X2 1012 G1 (m5-6Y57) supports; one source mentioned Wacom and a other MS pen. I find HP itself quite vague on, just referring it to HP active pen. I suspect Wacom AES? I saw a decent deal (without pen) but I only want to buy it if the pen protocol is Ntrig (or EMR is also fine). Thanks for taking the time.