a question about the purpose of "header" in gdkdnd

["xu victor" <gtkdevellist hotmail com>]

Hi all: 
i am a Newbie in GNOME, i met some questions when 
i read the gdk. 
it is from gdkdnd.c. 
i don't know what the header's purpose ; 
is there anybody can tell me? 

/////////////////// 
static gint 
motif_add_to_target_table (GList *targets) 
{ 
GList *sorted = NULL; 
gint index = -1; 
gint i; 
GList *tmp_list; 

............. 

if (index < 0) 
{ 
/* We need to make sure that it exists _before_ we grab the 
* server, since we can't open a new connection after we 
* grab the server. 
*/ 
motif_find_drag_window (TRUE); 

............. 

if (index < 0) 
{ 
guchar *data; 
............ 

MotifTargetTableHeader *header; 
........... 

data = g_malloc (total_size); 

header = (MotifTargetTableHeader *)data; 
p = data + sizeof(MotifTargetTableHeader); 

header ->byte_order = local_byte_order; 
header ->protocol_version = 0; 
header ->n_lists = motif_n_target_lists; 
header ->total_size = total_size; 

for (i = 0; i < motif_n_target_lists ; i++) 
{ 
............ 

}///////////

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