  We are developing a web-based interactive software to simulate crowded-field
imaging with the Imaging and Slitless Spectrograph Instrument for Surveys
(ISSIS) on board the future World Space Observatory - Ultraviolet (WSO-UV).
This new tool is aimed to prepare WSO-UV/ISSIS proposals to observe
multicomponent targets and dense fields. For a given combination of UV channel,
filters and exposure time, the user creates a set of point-like and extended
sources (source model). This source model produces a final image, which takes
into account a pixelated field of view, a realistic conversion between physical
flux and counts per second, the convolution with the expected point spread
function, a sky background and noise fluctuations. The current version of the
simulator is available at the Gravitational LENses and DArk MAtter (Glendama)
website, and it allows users to specify all relevant parameters of each
point-like or extended source, drag-and-drop sources by using a mouse or a
fingertip/stylus on a touchscreen, change the frame size or the brightness
scale, etc.
