Here is the documentation on BigFix Relay on TCL: http://www.ibm.com/support/knowledgecenter/SS6MER_9.5.0/com.ibm.bigfix.doc/Platform/Installation/c_tiny_core_introduction.html
I added it to the release post as well: BigFix 9.5 Patch 3 is now available
It seems like these instructions are how to do this from scratch, but there is also an ISO available for download here: http://support.bigfix.com/bes/release/9.5/patch3/
Specifically here: http://software.bigfix.com/download/bes/95/BesInstaller-9.5.3.211-tc.i686.iso
Well now that I read further, it seems the ISO is just the installers for use within TCL.
You can play with TCL on Windows using QEMU very easily: http://willhaley.com/blog/simple-portable-linux-qemu-vm-usb/