The SemWare Editor
The SemWare Editor (TSE) is a text editor computer program for DOS, OS/2, and Windows.
Starting in November 1985 as a shareware program called Qedit. Qedit was eventually modified to run as a Terminate and Stay Resident (TSR) program, and ported to OS/2 and eventually evolved (via rewrite) to TSE. TSE was eventually ported to Windows.