The following words have special meaning within commands of a menufile and may not be used for other things. Since upper and lower-case make a difference, MENU, menu and Menu represent different names.
menu
param
quit
The additional words listed in Table 8-22 are reserved for menufiles that have built-in menu commands enabled.
Table 8-22: Reserved Words
as ask basename boolean
cd chdir date directory
echo else elseif endfor
endif endwhile eval exit
export file for if
in int integer interrupt
length match money param
real rem result required
set size string strleft
strlen strmid strright time
to while