If there is another coup in Thailand the UDD (United Front of Democracy against Dictatorship) will take to weapons and fight the military to protect the government. The UDD has clashed with PAD before and are loyal to the Thaksin government.
The UDD has been to secret training camps where they learned to fight the military with what ever means possible. They also told the government not to step down even if the military push them to.
From my point of view UDD is just a bunch of thugs hired by the government to make problem and to help the government with tasks the police can not do. Lets hope we never have to see fighting on the streets on Bangkok.