>I want to call...
>set order to tag sorttemp...
>I will not know if there is a sorttemp out there.
>How do I check if the TAG exist?

lTagExist=.f.
for i=1 to tagcount()
    if tag(i)="SORTTEMP"
       lTagExist=.t.
       exit
    endif
endfor
if lTagExist
   set order to SORTTEMP
endif