http://www1.us.dell.com/content/products/productdetails.aspx/dimen_4600c?c
=us&cs=19&l=en&s=dhs&~page=1&~tab=viewstab
There's the url with a picture of the back of the Dell 4600C (either put
the url all on one line or just Google for "serial port Dell 4600C?"
and you'll get the page). The description says there is a serial port,
but I don't see one in the admittedly small picture. What does Dell
say?