Sequential Terminals are a VERY basic mechanism where you can code up command-lines which reprent terminal input. CICS then takes these lines and runs them as if they were put in on a 3270 Terminal. This is not of much use to anyone, apart from, maybe, issuing a sequence of CEMT commands. I know of some customers who activate TRUEs and GLUEs in this fashion.
Try to avoid this bit of CICS.
This was first published in March 2003