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SUBROUTINE HLPONF
C$ (Help Internal - Open New INFO File)
C$ Open a new INFO file and read its index. If the open fails
C$ because the file cannot be found, or because the index is
C$ invalid, LSTIDX is set to 0 in COMMON. The current file
C$ and node are saved on the node ring for possible later use
C$ by the "Last" command, unless the current command is already
C$ a "Last" command.
C$
C$ File names may be provided from "Footnote" and "Goto"
C$ commands, or from menu items in the current INFO file.
C$ These take the form of a single name which should normally
C$ be specified in such a manner as to allow default directory
C$ paths and/or file types to be provided automatically.
C$
C$ This version tries in order the names
C$
C$ filename.nfo
C$ filename
C$ $INFO/filename.nfo
C$ $INFO/filename
C$
C$ In the first two cases, the file is expected to be in the
C$ current file search path, usually the current user file
C$ area. This allows personal copies of any INFO files. The
C$ third and fourth specify a standard system area, "$INFO/",
C$ for the files. The names are intentionally in lower case
C$ so that they can work for all DEC and Unix systems. For
C$ other hosts, it will likely be necessary to change the file
C$ prefix (path) and suffix (type) strings.
C$
C$ If the logical name or environment variable INFO does not
C$ exist, then PLT is tried, and if that does not exist, then
C$ a default value is supplied.
C$ (18-Feb-1991)