God Invoking is called 請神 Cheng Sun in Cantonese, or Chieong Sin in Saamlawnese. It's simply like inviting the gods to come to your place to witness and help you with things. By learning this method here, you are invoking the gods to come over from the religious court. This allows you to worship the gods above, and also to do cultivation with the gods in front of you etc. Even if you are doing a ceremony (like exorcism and house cleansing) you can do this to pack in more power for better result.
Step 1 - Learn the Special Sword Finger
Step 2 - The RC Communication FU SC04 (fu book)
Step 3 - Without Altar
Step 4 - With Altar
Step 5 - Submitting Letter