How to get stored procedure parameters details?

Question

Where can I find information about stored procedure parameters? In my situation I need to know only the input parameters of given store procedure.

In the sys.o

Answer 1

select t1.[name] as [SP_name],t2.[name] as [Parameter_name],
t3.[name] as [Type],t2.[Length],t2.colorder as [Param_order]
from sysobjects t1
inner join syscolumns t2 on t1.[id]=t2.[id]
inner join systypes t3 on t2.xtype=t3.xtype
where t1.[name]='My_StoredProc_Name'
order by [Param_order]