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This says more:

The Open Group Base Specifications Issue 7 (http://www.opengroup.org/onlinepubs/9699919799/nframe.html)

Additional information on the differences:
sh-posix(1)...

Interesting, since this means that the implementation of ksh88 on HP-UX is not fully posix compliant.
They must be using a very early implementation where -a was used instead of -e, which was later...

In any other shell this will produce an error if there is more than one file present. If this works in a Korn shell it is probably because it is secretly using a shell builtin.
What shell are you...

I do not think -e has anything to do with it. -e should work in ksh. The problem is simply that wild card expansion is done by the shell before the list is past to test -e. This command only expects...

exists(){ [ -e "$1" ];};if exists /path/filename.*; then echo exists; else echo nope; fi
:)

Try this:
exists()
{
[ -e "$1" ]
}

if exists /path/filename.*
then
<do some work>
else
<no files>
fi