  The Baade's Windows of low obscuration towards the inner parts of the
Galactic bulge represent ideal places in which to develop an understanding of
the ISOGAL colour-magnitude diagrams. Unlike the case for the solar
neighbourhood, their contents are at a uniform distance from the Sun, affected
only by the finite thickness of the Bulge.
  The objects detected in the ISOGAL survey are found to be late-type M-giants
at the red giant tip or on the Asymptotic Giant Branch (AGB). The ISOGAL
colour-magnitude diagrams show that mass-loss starts at about M4 and increases
towards later types. Many non-Miras have mass-loss rates similar to
shorter-period Miras.
  The visible counterparts of the ISOGAL sources have been identified in the
database of the MACHO gravitational lensing survey. A first report of this work
is included here. It is found that nearly all the ISOGAL sources are
semi-regular variables (SRVs), which are many times more numerous than Miras.
Their stellar luminosities increase with period. Based on a simple
interpretation of the photometry, mass-loss rates from about 10^{-9} to 10^{-7}
solar masses per year are found for SRVs with periods in excess of about days.
