you can use xp_instance_regread to find the startup parameters on 2005 and 2008. the key path would have to chnage for named instances.

DECLARE @startup VARCHAR(255)

DECLARE @arg VARCHAR(10)

DECLARE @i INT

SET @i = 0

SET @startup = ''

WHILE(@startup IS NOT NULL)

BEGIN

SET @arg = 'SQLArg'+CAST(@i AS VARCHAR(2))

SET @startup = NULL

EXEC xp_instance_regread N'HKEY_LOCAL_MACHINE', N'Software\Microsoft\MSSQLServer\MSSQLServer\Parameters', @arg, @startup OUTPUT

SELECT @startup

SET @i= @i+1

END