argument lists in functions

[John Russell]

Can someone who knows some more about the OB code than I do answer this
question.  What is the point of having argment lists like this:

void place_client(ObClient *client, gint *x, gint *y)

where *x and *y are merely pointers to client->area.x and
client->area.y.  In functions such as this, x and y are modified inside
the functions to modify the client position or whatever it is the
function is meant to do.  

Why not _just_ pass in a pointer to the client?  Why not say

void place_client(ObClient *client)
{
	and then directly modify the position numbers there.  

This function is just one example of this and I was curious to know the
motivation behind this.  Thanks.

John