"Introduction In the early 1980s@ the Defense Intelligence Agency (DIA) undertook the tasks of developing a TELNET capability to access full screen applications across a packet switching network. This effort was successful by implementing Data Entry Terminal (DET) options within the TELNET protocol based on RFC 732. These DET options have been implemented on IAS@ MVS@ OS86 and UNIX operating systems. DET options are being developed for VM and VMS operating systems. The Department of Defense Intelligence Information System (DODIIS) is a confederation of heterogeneous computer systems and remote terminals utilizing the Defense Data Network (DDN) as the communications backbone (namely the SCINET/DSNET-3). Although the reason for implementing a DET option specification was based upon data base application interfaces@ the use of a full screen TELNET provides a method to achieve higher efficiency on the network. Most terminal to host applications on the ARPANET are character echo TELNETs. This is both costly in time and network utilization@ since one character pressed on the keyboard generates a datagram composed of TCP/IP headers plus the character sent to the host and the host echoes back a similar datagram. In the DODIIS community@ programmers are highly encouraged to implement full screen applications; line at a time is acceptable; and character remote echo mode is discouraged. This RFC in its final form will be implemented on SCINET. During the interim period@ the ""DODIIS TELNET Network Virtual Data Entry Terminal (NVDET) Option Specification""@ DIA@ April 1983@ will be implemented."