  A method for searching for emission-line objects in "windows" between
atmospheric emission lines using multislits is described. A search for Ly alpha
emitters at z = 6.5 in the 9130A window using this technique is being carried
out with the multi-object spectrograph on CFHT. This technique could be
extended to similar windows at longer wavelengths, aided by the (1 + z) factor
in observed equivalent widths. In the J band there are windows corresponding to
Ly alpha at z = 7.7, 8.7 and 9.3; in the H band, there are two at z = 11.9 and
13.4. Multislit window observations in these bands coupled with photometric
redshift information offer perhaps the best method of the detecting extremely
high redshift galaxies.
