Half the population of Denver seems to know about the courtesy phones installed at the Tattered Cover Book Stores in Cherry Creek and LoDo. Discreet signage informs patrons getting ready to "ride the light" to limit calls to three-minute locals. But a bit of persistent eavesdropping reveals the full scope of the phones' functions: People with memorized resumés use them to apply for multiple jobs; intimacies are offered and sometimes accepted for a nighttime rendezvous; mysteriously involved business dealings are discussed by homeless people. And that's just a sampler of the over-the-wire goings-on at the TC: One-stop shoppers and tourists often have even juicier tidbits to offer.