*_vtcld environment variables
DISPLAY-
If set, specifies X display for output.
VTCL_DEBUG-
Turns on debugging output for interpreter, server, and command libraries.
Values greater than 10 capture send data, greater than 20 capture receive data.
VTCL_DISABLE_HELP-
Disables access to the help viewer, but allows help key and Help
button
callback handling.
VTCL_SUPPRESS_HELP-
Disables access to the help viewer and all help callbacks.
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SCO OpenServer Release 5.0.7 -- 11 February 2003