It has a simple syntax and is also programmable, so Tcl users can write command procedures to provide more powerful commands than those in the built-in set. Tk implements the Motif look and feel. LaTeX is a set of macros written in TeX, designed to simplify the the typesetting of a document by allowing the user to concentrate on the content and structure of the document rather than the exact appearance of the finished product. Many utilities to manipulate the system like LaTeX to html or vice-versa are also present. The X Window System is a network transparent window system developed at MIT which runs on a wide range of computing and graphics machines.
Commercial implementations are also available for a wide range of platforms.
X Window System servers run on computers with bitmap displays. The server distributes user input to and accepts output requests from various client programs through a variety of different interprocess communication channels. This family contains X11 distribution and contributions. Perl has powerful text-manipulation functions. It eclectically combines features and purposes of many command languages.