F3 ?

Dear Colleagues -- Working hard to identify a problem
with a Perl program edited using WinEDT, I am being
driven to distraction by the latter's out-of-the-box
treatment of "F3" after "Ctrl-F".  "Ctrl-F" launches
a "Find" dialogue box, as a Windows user would
expect, but "F3" does /not/ perform a "Find next",
unlike most (every ?) other Windows program.
Is this intentional, if so what is the reason,
and can it be fixed by the user ?

Philip TAYLOR