Compaq DEC Text Processing Utility AA-PWCBD-TE - Manual (Page 16)

Overview of the DEC Text Processing Utility
1.2 Description of DECwindows DECTPU
The DECwindows version of DECTPU does not provide access to all of the
features of DECwindows. For example, there are no DECTPU built-in procedures
to handle floating-point numbers or to manipulate entities such as lines, curves,
and fonts.
With DECwindows DECTPU, you can create a wide variety of widgets, designate
callback routines for those widgets, fetch and set geometry and text-related
resources of the widgets, and perform other functions related to creating a
DECwindows application. For example, the DECwindows EVE editor is a text
processing interface created with DECwindows DECTPU.
1.2.2 DECwindows DECTPU and the DECwindows User Interface Language
You can use DECTPU programs with DECwindows User Interface Language
(UIL) files just as you would use programs in any other language with UIL
files. For an example of a DECTPU program and a UIL file designed to work
together, see the description of the CREATE_WIDGET built-in in the DEC Text
Processing Utility Reference Manual. For more information about using UIL
files in conjunction with programs written in other languages, see the VMS
DECwindows Guide to Application Programming.
1.3 Description of EVE
The Extensible Versatile Editor (EVE) is the editor provided with DECTPU. EVE
is easy to learn and to use. You can access many of EVE’s editing functions by
pressing a single key on the keypad. EVE is also a powerful and efficient editor,
which makes it attractive to experienced users of text editors. You can access
more advanced editing functions by entering commands on the EVE command
line. Many of the special features of DECTPU (such as multiple windows) are
available with EVE commands. You can access other DECTPU features by
entering DECTPU statements from within EVE.
EVE has both a character-cell and a DECwindows interface. To use EVE’s
DECwindows interface, you must be using a bit-mapped terminal or workstation.
Although EVE is a fully functional editor, it is designed to make customization
easy. You can use either DECTPU statements or EVE commands to tailor EVE to
your editing style.
You can write extensions for EVE or you can write a completely separate interface
for DECTPU. Figure 1–2 shows the interface choices for DECTPU.
1–4 Overview of the DEC Text Processing Utility