  The {\em DIOGENESS} X-ray crystal spectrometer on the {\em CORONAS-F}
spacecraft operated for a single month (25~August to 17~September) in 2001 but
in its short lifetime obtained one hundred and forty high-resolution spectra
from some eight solar flares with {\em GOES} importance ranging from C9 to X5.
The instrument included four scanning flat crystals with wavelength ranges
covering the regions of \sixiii\ (6.65~\AA), \sxv\ (5.04~\AA), and \caxix\
(3.18~\AA) X-ray lines and associated dielectronic satellites. Two crystals
covering the \caxix\ lines were oriented in a ``Dopplerometer'' manner, i.e.
such that spatial and spectral displacements both of which commonly occur in
flares can be separated. We describe the {\em DIOGENESS} spectrometer and the
spectra obtained during flares which include lines not hitherto seen from
spacecraft instruments. An instrument with very similar concept is presently
being built for the two Russian {\em Interhelioprobe} spacecraft due for launch
in 2020 and 2022 that will make a near-encounter (perihelion $\sim 0.3$ a.u.)
to the Sun in its orbit. We outline the results that are likely to be obtained.
