feature_calldll is used with the built-in function supported to determine if the current platform supports calling external functions and procedures in DLLs.
if supported(feature_calldll) then
begin
//Calling DLLs is supported so go ahead and make the calls.
end
else
begin
//Calling DLLs is not supported so do something else of abort.
end
Operating Systems: All
Standard Pascal: No