Useful information regarding the process can be found at the TWIC home page at:  http://www.tsa.gov/what_we_do/layers/twic/index.shtm. 

Information regarding the pre-application process required prior to scheduling an in-person appointment can be found at:  http://www.tsa.gov/what_we_do/layers/twic/index.shtm. 

Information may also be obtained by calling 1-866-347-8942.