The OPEN statement opens a data file, creating
a file with the specified name if the BHT does not already have
that file.
filename must be in 8.3 format: 1 to 8 character for the base
name and 1 to 3 characters for the file extension.
The file name can use alphabets, numerals, hyphens (-), and
underbars (_), but the last two cannot appear at the beginning.
File
names are not case sensitive.
The following file extensions are
not allowed.
PD3,PD4,EX3,EX4,FN3,FN4,FLD
fileno can be any number from 1 to 16 not currently in use by
another device file (bar code or communications). Use the same
number to read data from, write data to, and close the data file.
Reading and writing data requires first opening the data file
and then specifying its fields with a FIELD statement. →Defining
data file fields
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