You can request a registry!
DECLARE @LoginMode int
EXEC master..xp_regread
@rootkey = 'HKEY_LOCAL_MACHINE',
@key = 'SOFTWARE\Microsoft\Microsoft SQL Server\MSSQL.1\MSSQLServer\',
@value_name = 'LoginMode',
@value = @LoginMode output
PRINT @LoginMode
1 = SQL
2 = Mixed
@keymay vary depending on your installation. I have several instances.
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