You could define the custom on key F11 routine where you modify settings for the sysmenu, titlebar, etc.. as needed.

Here is the example:

on key kable F11 do i1

*--------------
Procedure i1
if _screen.TitleBar= 0
     _screen.TitleBar= 1
else
     _screen.TitleBar= 0
endif

>Hello *.*
>
>I´d like to do the same full screen effect of F11 in internet explorer (press F11 to see) using VFP 6.
>
>Is it possible?
>
>Thanks in advance.