A function which opens a disk data file for update (reading and writing) and returns the handle of the file. This number must be used in subsequent references to the file with BGET#, BPUT#, INPUT#, PRINT#, EXT#, PTR#, EOF# or CLOSE#.
A returned value of zero signifies that the specified file was not found.
X=OPENUP "jim"
X=OPENUP A$
X=OPENUP (A$)
X=OPENUP ("FILE1")
Syntax
<n-var>=OPENUP(<str>)