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Before the launch of the Rossi X-ray Timing Explorer (RXTE) it was recognizedthat neutron star accretion disks could extend inward to very near the neutronstar surface, and thus be governed by millisecond timescales. Previous missionslacked the sensitivity to detect them. The kilohertz quasi-periodicoscillations (QPO) that RXTE discovered are often, but not always, evident inthe X-ray flux. In 8 years RXTE has found kilohertz signals in about a fourthof 100 low-mass X-ray binaries (LMXB) containing neutron stars. The observedpower spectra have simple dominant features, the two kilohertz oscillations, alow frequency oscillation, and band-limited white noise. They varysystematically with changes in other source properties and offer thepossibility of comparison with model predictions. New information from themillisecond pulsars resolves some questions about the relations of the QPO andthe spin. Coherence, energy spectrum and time lag measurements have indicatedsystematic behaviors, which should constrain mechanisms.Comment: 8 pages, 8 figures, to appear in the proceedings of "X-Ray Timing  2003: Rossi and Beyond", eds. P. Kaaret, F.K. Lamb, & J.H. Swank (Melville,  NY: AIP

Quasi-Periodic Oscillations from Low-mass X-Ray Binaries with Neutron Stars