getnelsonmode() returns current Nelson mode used.

There are 6 modes:

BASIC_ENGINE: Nelson used as engine without any graphics.

ADVANCED_ENGINE: Nelson used as engine with graphics/gui.

BASIC_TERMINAL: Nelson launched as terminal without graphics.

ADVANCED_TERMINAL: Nelson launched as terminal with graphics/gui.

GUI: Nelson launched as a graphical application (default).

WEB_GUI: Nelson launched as a web application.