XTERM provides VT100/VT220 and selected features from higher-level terminals such as VT320/VT420/VT520 (VTxxx).
It emulates VT220 and Tektronix 4010.
When customer needs to use XTERM emulation type with TN Client 2-in-1 Generic license, one must be activated and registered for VT emulation.
TN Client 2-in-1 product license will ask you to register for a specific emulation type (VT|HP or IBMHOST)
TN Client 2-in-1 product license works for VT/HP or IBM, but not all. You have to select which one you will use when you activate and register the license.
TN Client 4-in-1 works with for both types (VT|HP or IBMHOST) and does not ask you to specify which emulation type to use during product activation and registration.
The 4-in-1 TN client refers to a single product that works with all four different emulation types. They are VT, HP, IBM 3270 and IBM 5250.
The 2-in-1 supports VT/HP or IBM 3270/5250 types of emulation. When one tries to activate and register license one must chose desired emulation type.
XTERM is a VT emulator type.