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NGC 6791 is one of the richest old open clusters in the Milky Way. Itsposition above the Galactic plane and the number density makes it aninteresting middle ground between Galactic open and globular clusters. We aimto detect the UV bright population of NGC 6791 using \textit{AstroSat}/UVITimages in near-UV and far-UV filters and characterise the known post masstransfer systems such as blue straggler stars (BSSs). We identified 20 memberswith large UV flux (out of 91 cluster members among 1180 detections),suggestive of binarity, interactions or stellar activity using multi-wavelengthspectral energy distribution analysis. We characterised 62 isolated clustermembers, including five hot subdwarfs (sdA/sdB). Additionally, we detected tensdA/sdB/extremely low mass white dwarf (ELM) type candidates hidden alongsideother cluster members. Additionally, we report the discovery of four candidateblue lurkers, which are main sequence stars with mass accretion history. Wereport that this cluster has a variety of stellar (pre-)remnants, such as sdBs,sdAs, and ELM white dwarfs, that are by-products of binary evolution. The aboveare likely to be post mass transfer binaries found throughout the evolutionaryphases from the main sequence to the post horizontal branch. Therefore, thisdynamically old open cluster is unique, making it an ideal testbed fordynamical studies.

UVIT Open Cluster Study. X. Rich Collection of Post Mass Transfer Systems in NGC 6791