The commands between the two EOI labels are supplied to fastload. You can use any label pair that you like just as long as the second one
is on a line by itself with no leading or trailing whitespace.
The file name is supplied on the command line that runs the script and is accessed via the $1 in the script. Invocation example where
todays_file is the name of the file to be loaded (and may include a path):
myfastload.sh todays_file
On windows, you could use one of the Unix emulators such as cygwin. On the mainframe - I have no idea.
All the best
Glenn Mc