txiterm is a wrapper around the xiterm+thai(1) program that invokes the latter program with proper Thai
environment and font setup.
All arguments to txiterm are passed as-is to xiterm+thai with additional preset -fn option, so that you
do not need to set it again.
See the xiterm+thai manual page for more information on xiterm+thai-options.
Note:txiterm needs nectec18 - Thai TIS-620 X font from the xfonts-thai-nectec package to allow the
program to render Thai TIS-620 text properly in the terminal.