dtlogin is a display manager for the X Window System

X Window System

The X window system is a computer software system and network protocol that provides a basis for graphical user interfaces and rich input device capability for networked computers...

. It is typically found on Unix

Unix

Unix is a multitasking, multi-user computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs, including Ken Thompson, Dennis Ritchie, Brian Kernighan, Douglas McIlroy, and Joe Ossanna...

 and Unix-like

Unix-like

A Unix-like operating system is one that behaves in a manner similar to a Unix system, while not necessarily conforming to or being certified to any version of the Single UNIX Specification....

 computer systems running The Open Group's Common Desktop Environment

Common Desktop Environment

The Common Desktop Environment is a desktop environment for Unix and OpenVMS, based on the Motif widget toolkit.- Corporate history :...

 (CDE) desktop environment

Desktop environment

In graphical computing, a desktop environment commonly refers to a style of graphical user interface derived from the desktop metaphor that is seen on most modern personal computers. These GUIs help the user in easily accessing, configuring, and modifying many important and frequently accessed...

. It allows users to log in to a local system; it can also handle remote XDMCP requests.

This is still the default display manager for Solaris 10 even though CDE is no longer the default desktop environment, having been replaced by the Java Desktop System

Java Desktop System

OpenSolaris Desktop, formerly Java Desktop System , is a desktop environment now developed by Oracle Corporation available for Solaris, and formerly Linux....

, a modification of GNOME

GNOME

GNOME is a desktop environment and graphical user interface that runs on top of a computer operating system. It is composed entirely of free and open source software...

. It can also start other environments like KDE

KDE

KDE is an international free software community producing an integrated set of cross-platform applications designed to run on Linux, FreeBSD, Microsoft Windows, Solaris and Mac OS X systems...

, XFCE

Xfce

Xfce is a free software desktop environment for Unix and other Unix-like platforms, such as Linux, Solaris, and BSD – though recent compatibility issues have arisen with regard to BSD Unix platforms...

 or Window Maker

Window Maker

Window Maker is a free and open source window manager for the X Window System, allowing graphical applications to be run on Unix-like operating-systems...

.