Documentation can be found in the manual page (last updated 2000-02-09). It contains detailed description of command line options, keystrokes and a few hints.
Tscan is available in the Super-Kamiokande CVS repository in atmpd/src/displays/tscan.
Some images of Super-Kamiokande events prepared for print publications and presentations. They show some of the things that can be done with tscan.