eclipse contains hardcoded in its code a list of standard infrared stars used by VLT astronomers to calibrate ISAAC for zero-points.
The std command is meant to give access to this (small) catalog of stars, to search e.g. for the closest star from a position, with a magnitude above say 11 in band Ks. It offers several search criteria and result display styles. Do not expect a database server with SQL requests, it is only there to provide information about the stars contained in the code.
std man page