| Variable
| Purpose
|
| SERVERHOST
| Sets the name of the machine running the X server.
|
| CLIENTHOST
| Sets the machine running the clients.
|
| HOSTNAME
| Sets the canonical hostname running the clients.
|
| USER
| Sets the name of the user running the program.
|
| HOME
| Specifies the user’s home directory.
|
| VERSION
| Returns the X major protocol version. This can be important to some X applications.
|
| REVISION
| Returns the X minor protocol revision. This can be important to some X applications.
|
| VENDOR
| Returns the vendor of your X server. Usually very unimportant.
|
| RELEASE
| Returns the X-server release number, such as 6 for X11R6.
|
| WIDTH
| Sets the width of your display in pixels.
|
| HEIGHT
| Sets the height of your display in pixels.
|
| X_RESOLUTION
| Returns the X resolution of your display in pixels per meter.
|
| Y_RESOLUTION
| Returns the Y resolution of your display in pixels per meter.
|
| PLANES
| Returns the number of bit planes supported in the default root window.
|
| BITS_PER_RGB
| Returns the number of significant bits in an RGB color.
|
| TWM_TYPE
| Returns the twm type; it’s always fvwm.
|
| CLASS
| Returns the visual class (one of StaticGray, GrayScale, StaticColor, PseudoColor, TrueColor, DirectColor, or NonStandard).
|
| COLOR
| Returns yes for a color, no for a gray.
|
| FVWM_VERSION
| Returns the fvwm version.
|
| OPTIONS
| Lists the options compiled in the window manager.
|
| FVWMDIR
| Sets the path for modules.
|