Opens a file for reading or writing and associates a logical name with
the file.

Format
 OPEN logical-name file-spec

Additional information available:

ParametersQualifiers

logical-name
 A character string of 1 through 63 characters.
file-spec
 File specification of the file being opened. The file type defaults to
 DAT. Wildcard characters are not allowed.

Additional information available:

/APPEND/ERROR/READ/SHARE/WRITE

 Opens an existing file for output. New records are added to the end of
 the file. Incompatible with the /WRITE qualifier.

 Transfers control to the location specified by label (in a command
 procedure) if the OPEN operation results in an error. This qualifier
 overrides any ON condition action specified.

 Opens the file for reading.

 /NOSHARE
 Permits other users read or read/write access to the file. Specify
 option as READ or WRITE (default).

 Opens the file for writing. If the file already exists when you open
 it for write access, a new version is created.