ThinkOrSwim chart scripting language


I didn't want to go off topic in the PRC discussion topic so I thought I'd ask this here.

What (computer) language are the ThinkOrSwim chart studies written in? I searched their web site but could not find any reference to it.
I'm new to ThinkOrSwim, but have been using this site to help me with ThinkScript. https://www.thinkorswim.com/tos/thinkScriptHelp.jsp?laf=bright Hope that helps.
There are a couple of sites that one may want to look at too.

http://www.thinkscripter.com/

http://finance.groups.yahoo.com/group/TOS_thinkscript/