--source include/windows.inc
#
# only global
#
select @@global.named_pipe;
--error ER_INCORRECT_GLOBAL_LOCAL_VAR
select @@session.named_pipe;
show global variables like 'named_pipe';
show session variables like 'named_pipe';
select * from information_schema.global_variables where variable_name='named_pipe';
select * from information_schema.session_variables where variable_name='named_pipe';

#
# show that it's read-only
#
--error ER_INCORRECT_GLOBAL_LOCAL_VAR
set global named_pipe=1;
--error ER_INCORRECT_GLOBAL_LOCAL_VAR
set session named_pipe=1;