@chapter Changes to TCP/IP Applications
@label[chapter-tcp-app]

This chapter outlines changes to TCP/IP for Release 4,
with a section devoted to each major TCP service.

@section FTP

@csubindex[TCP][FTP]@cindex[FTP command]
The command interface to FTP, formerly called @l(ftp:cmd),
is now defined as
@see[ftp:ftp][fun].
Various options have been modified and improved,
and the interface is more robust.

Other changes to the File Transfer Protocol are internal and should not be visible to the user.

@section Telnet

@csubindex[TCP][Telnet]
Telnet provides remote terminal access via TCP/IP.
The various Telnet interfaces have been enhanced significantly.

Most importantly, the Telnet interface accessible via @syson[T]
now works properly over TCP/IP.

The new Telnet provides a robust interface for remote logins between Lambdas.
When the Lambda Telnet interface contacts a Telnet Server
running on another Lambda, the two programs agree to use the Chaosnet Supdup output options.
This results in dramatically improved behavior:
standard rubout handling features are provided, 
LISP machine characters are displayed properly, and
special keys such as @abort@  are handled correctly.

See Section @ref[section-telnet], @nameref[section-telnet], for details.

@section SMTP

The SMTP (Simple Mail Transfer Protocol) software has not changed since Release 3.
Lambda hosts cannot provide full mail-server capabilities, but
ZMail does work properly with other SMTP mail hosts.

The function @l(ftp:make-unix-zmail-init-file) @findex[zwei:make-unix-zmail-init-file]
has been moved to the @l(ZWEI:) package.

@section Imagen Printer Driver

@cindex[Imagen printer]
The networking and printer software support Imagen laser printers  (Imagen model IP/II and compatibles).
A standalone Imagen printer is accessed via TCP/IP.

With Release 4, the @l(:IMAGEN) driver is fully supported
and much improved over previously distributed versions.

Users are no longer forced to log in in order to send files to Imagen
printers.

The Imagen driver now supports the printing of individual
pages of a text file.  This may be done with the @l(:page-list) keyword, followed
by a list of the desired page numbers.
For example:

@lisp
(hardcopy-file "programs.lisp" :page-list '(3 7 13))
@end(lisp)

See Section @ref[section-imagen], @nameref[section-imagen], for further details.

@section DISK

@csubindex[TCP][DISK]
The TCP DISK Server (LMIDISK protocol) is more dependable, and
provides a full range of functionality similar to Chaosnet.

See Section @ref[section-disk], @nameref[section-disk], for information on using the DISK functions.

Also see Section @ref[section-tcp-disk-compatibility], @nameref[section-tcp-disk-compatibility],
for information on communicating between Release 3 and Release 3 DISK servers.




















@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c ---------------------------------------------------------------------------
@c end tcp-app1