Ok Steve, this is my code in the table trigger, and it takes the parameters to the dll.  I didn't write the dll it was writen by the vendor, but if there is anyway you can help with more info, I will inform the vendor to correct whatever is wrong

DECLARE @cmd sysname, @var sysname, @con sysname

SET @var = (select max(id) from Inserted)

SET @con = (Select principal from ISLPrimeBrokersEquitiesOutput where id in (Select max(id) from Inserted))

SET @cmd = 'C:\ClientBroking.exe ' + @var + ' ,'+ 'ISLPrimeBrokersEquitiesOutput'+','+ @con+''

EXEC master..xp_cmdshell @cmd