  A search for exclusive or quasi-exclusive W(+)W(-) production by
photon-photon interactions, pp to p(*)W(+)W(-)p(*), at sqrt(s) = 7 TeV is
reported using data collected by the CMS detector with an integrated luminosity
of 5.05 inverse femtobarns. Events are selected by requiring a mu(+/-)e(-/+)
vertex with no additional associated charged tracks and dilepton transverse
momentum pt(mu(+/-)e(-/+)) > 30 GeV. Two events passing all selection
requirements are observed in the data, compared to a standard model expectation
of 2.2 +/- 0.4 signal events with 0.84 +/- 0.15 background. The tail of the
dilepton pt distribution is studied for deviations from the standard model. No
events are observed with pt > 100 GeV. Model-independent upper limits are
computed and compared to predictions involving anomalous quartic gauge
couplings. The limits on the parameters a[W,(0,C)]/Lambda^2 with a dipole form
factor and an energy cutoff Lambda(cutoff) = 500 GeV are of the order of 10E-4.
