1. Certified Technology Specialist. This status is by attained by successfully completing an A/V industry training program run by InfoComm International. Info at http://www.infocomm.org/cps/rde/xchg/infocomm/hs.xsl/certification.htm. 2. Correct to Straw or Color Temperature Straw. Referring to a range of lighting color correcting filters used in studio applications. 3. Clear To Send. A flow-control handshaking signal used in the EIA-232C (RS-232C) serial communications protocol.