For those of you who do not understand the original post, I will rewrite it clearly.
1. Get a pet.
2. Make a macro thats clicks ActionButtonX (your pet) about 6 times, and then ActionButtonY (the macro) once.
EXAMPLE: My pet is in my ActionButton1 slot. The macro I just created is in my ActionButton2 slot.
The macro says:
/click ActionButton1
/click ActionButton1
/click ActionButton1
/click ActionButton1
/click ActionButton1
/click ActionButton1
/click ActionButton2
This creates a loop, because the macro reclicks itself. This will take out and put back your pet a countless number of times, which lags the server.
3. Put your pet in ActionButtonX and your macro in ActionButtonY.
4. Click the macro to lag the server.
5. Be prepared to get your account PERMANENTLY BANNED.
Note: Trial accounts CAN be tracked back to your real account.