Use sp_procparm to show information about stored procedure parameters.
sp_iqprocparm sp_iqshowcompression, dbo, system proc_name proc_owner parm_name parm_type parm_mode domain_name width scale default sp_iqshowcompression dbo @owner_name normal in char 128 0 (NULL) sp_iqshowcompression dbo @table_name normal in char 128 0 (NULL) sp_iqshowcompression dbo @column_name normal in char 128 0 (NULL) sp_iqshowcompression dbo Column result out char 128 0 (NULL) sp_iqshowcompression dbo Compression result out char 3 0 (NULL)