Yes, it is a place holder.
The SFCOP's c++ code probably is something like:
char *GetLayoutDescription()
{
char *result;
int height;
int width;
GetClientSize(&width, &height);
if ( width <= 640 || height <= 480 )
{
result = "640x480";
}
else if ( width <= 800 || height <= 600 )
{
result = "800x600";
}
else if ( width <= 1280 || height <= 0 )
{
result = "1280x800";
}
else if ( width <= 1366 || height <= 768 )
{
result = "1366x768";
}
else if ( width <= 1440 || height <= 0 )
{
result = "1440x900";
}
else if ( width <= 1600 || height <= 900 )
{
result = "1600x900";
}
else if ( width <= 1920 || height <= 1080 )
{
result = "1920x1080";
}
else
{
sprintf(result, "%dx%d", width, height);
}
return result;
}