
Willows Twin Configuration Guide

The twin library is configurable using the twin configuration file.  If the
file system.twinrc exists in the current directory, it is used.  If the file
does not exist, the file .twinrc in the users home directory is used.  If that
file does not exist, the file system.twinrc located the directory given by
the environment variable TWINDIR is used.  If the file does not exist at all,
default values for all configurable elements will be used.  

The twin configuration file is a standard windows initialization file and 
consists of seven sections, with defined keywords for each section.  The 
defined sections are:

  Section		Configures parameters for...
  -------               ----------------------------
  [Boot]		startup configuration settings
  [Windows]		run-time configuration settings
  [PortAliases]		mapping of COM, LPT ports
  [Font Alias]		font aliases 
  [Colors]		mapping of standard colors
  [XDOS]		mapping of DOS drives
  
In the following table, the defined keywords with their default values are
given.  Those values that can be overridden by an environment variable have
an additional field defining the variable.


Section		Keyword			Default		Environment Variable
-------		-------			-------		--------------------
[BOOT]		"display",		":0.0",		"DISPLAY"
		"screenheight", 	0,
		"screenwidth", 		0,
		"windows",		"./",		"TWINDIR"
		"temp",			"/tmp",		"TMP"
		"path",			0,		"OPENPATH"
		"tasking",		"1",	
		"logfile",		"-",		"LOGFILE"
		"logmask",		"-1",
		"printer",		0

		"fatal",		0
		"syncronous",		0
		"colormap",		0
		"dither",		0
		"debugger", 		0
		"nopaging", 		0
		"verbose", 		0

		"control", 		0

[WINDOWS] 	"DoubleClickRate", 	"250"
		"CursorBlinkRate", 	"500"
		"FontFace", 		"helvetica"
		"FontSize", 		"18"
		"FontWeight",   	"700"
		"HelpProgram", 		"twinhelp"
		"IconFontFace", 	"helvetica"
		"IconFontSize", 	"14"

[colors]

[Font Alias]

The next section in the configuration file consists of keyword/data pairs that
are not predefined.  This section allows control over the use of fonts by 
allowing font face names to be aliased to alternative fonts, and by restricting
a given font to a range of sizes.  As the syntax shows below, at a minimum, an
alternative face name needs to be provided.  A minimum size for that font can
be supplied, and must be supplied if a maximum size is supplied.  The alias
font name, <newfacename> may be the same as the original <facename> if a range
of font sizes needs to be specified for a particular font.

keyword	  value with optional range
-------	  -------------------------
<facename=<newfacename>[,min[,max]]

[Colors]

The colors section maintains colors for the standard windows components.
The names of the components with their default colors  is given in the
table below.

	Window Element		Default Color
	--------------		-------------
	Scrollbar 		RGB(192,192,192)
	Background 		RGB(255,255,255)
	ActiveTitle 		RGB(0,0,192)
	InactiveTitle 		RGB(255,255,255)
	Menu 			RGB(255,255,255)
	Window 			RGB(255,255,255)
	WindowFrame 		RGB(0,0,0)
	MenuText 		RGB(0,0,0)
	WindowText 		RGB(0,0,0)
	TitleText 		RGB(255,255,255)
	ActiveBorder 		RGB(192,192,192)
	InactiveBorder 		RGB(192,192,192)
	AppWorkspace 		RGB(192,192,192)
	Hilight 		RGB(255,0,0)
	HilightText 		RGB(255,255,255)
	ButtonFace 		RGB(192,192,192)
	ButtonShadow 		RGB(128,128,128)
	GrayText 		RGB(128,128,128)
	ButtonText 		RGB(0,0,0)
	InactiveTitleText 	RGB(0,0,0)

[XDOS]
The xdos section consists of keyword/data pairs that controls the mapping of
DOS drive names to the native filesystem.  This configuration allows a DOS
drive to be mapped to either a directory or a drive emulator.  An example of
the mapping is given below.

	[xdos]
	C=/
	A=/dev/fd0

In this example, the DOS emulated drive C: is mapped to the root directory, and
the emulated drive A: uses the floppy drive.  Files on the floppy drive are
accessed using a fully qualified name, eg. A:\SETUP.INF.  In this case, the
floppy drive should not be mounted.


