addition to protocols used in commercially available terminal machines, xterm added a few protocols that have been adopted by other terminal emulators, such as:
* Mouse tracking: Support for buttons 4 and 5 was added in patch 120.
* 16-color terminal protocol: Added in patch 39.
* 256 colors terminal protocol: Added in patch 111.
* 88-color terminal protocol: Added in patch 115.
* Custom color palette: Ability to specifying the RGB values for palette entries was added in patch 111.

Fonts