A Theme in NeXtMidas is the way a graphical component looks. There are two basic ways for changing this appearance: the /THEME= switch, which can be applied to graphical commands and the LOOKANDFEEL command, which changes the appearance of all Swing components (widgets, panels, plots, etc).
The /THEME= switch is generally used to specify a different Theme by name from a pre-set list of Themes (DeskTop, Default, WoB, GoB, BoW, MnM, Browser, Gear1, Gear2, Gear3, Gear4, and Nak). The /THEME= switch can also be used with the PANEL and PLOT commands to pass in a Table of colors to adjust the current Theme. See the SWITCH, PLOT and PANEL explain files for more details.
Users who want to have all their components share the same Theme object, perhaps for performance reasons, can do so using the /SHARETHEME switch.
The LOOKANDFEEL command updates the Swing look and feel through the Swing UIManager. See the LOOKANDFEEL explain file for more details.