On Mon, 02 Feb 2004 12:05:02 GMT, schachmal
wrote:

I think it has something to do with philly cream cheese. Can someone
explain?

Philadephia, yes; cream cheese, no. The 'authentic' ingredient seems
to often be another Kraft product -- jarred (or presurrized can?)
Cheese Whiz processed cheese (sauce). The sandwiches originated in and
are a specialty of Philadelphia restaurants. Thin sandwich steaks on a
sub roll with sauted onions and green peppers and some sort of
meltable cheese.