I believe the answer to all three questions is "not inherently".
Demons finding mages or vampires: Perhaps an Embed, Exploit or Demonic Form could do it, but I don't know of any. (Edit: Aura Sight)
Mages finding mages: Mages with Active Mage Sight can tell when another mage is casting a spell, and there's a Prime spell for determining whether the subject is a Sleeper (regular human), Sleepwalker (not regular human) or Awakened (mage). Mages also know when most supernatural effect occurs (due to Passive Mage Sight) so they can get reasons to go snooping around even if the other person isn't behaving suspiciously.
Vampires hiding from demons: Vampires can use Obfuscate to hide themselves. An Obfuscate Devotion would be able to hide their nature without hiding themselves. Vampires can also use Blush of Health to appear alive in order to fool mundane senses. Otherwise vampires with low Humanity will appear deathly pale or corpselike.
Demons finding mages or vampires: Perhaps an Embed, Exploit or Demonic Form could do it, but I don't know of any. (Edit: Aura Sight)
Mages finding mages: Mages with Active Mage Sight can tell when another mage is casting a spell, and there's a Prime spell for determining whether the subject is a Sleeper (regular human), Sleepwalker (not regular human) or Awakened (mage). Mages also know when most supernatural effect occurs (due to Passive Mage Sight) so they can get reasons to go snooping around even if the other person isn't behaving suspiciously.
Vampires hiding from demons: Vampires can use Obfuscate to hide themselves. An Obfuscate Devotion would be able to hide their nature without hiding themselves. Vampires can also use Blush of Health to appear alive in order to fool mundane senses. Otherwise vampires with low Humanity will appear deathly pale or corpselike.
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