I thought that I already had a Set_Exists("Set_Name") : Boolean
function...but I didn't. Thanks for the conversation, this code works in
V13 (what I have open right now):

C_BOOLEAN($0;$exists)
C_TEXT($1;$set_name)

$set_name:=$1

Error:=0

ErrorHandler_Install ("ErrorHandler_SuppressError")

C_BOOLEAN($is_in_set)
$is_in_set:=Is in set($set_name)

ErrorHandler_InstallPrevious

$exists:=Error=0 // You could test for error 39 to be a bit more specific.

$0:=$exists

...this assumes that you install a valid error handler, otherwise you'll
get some other error...
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