In true desi style, the Shalimar folks have no proper process for sign up and table access. Its a free for all. Very often customers get into arguments about who showed up first. At least on one occasion I heard there was serious brawl!
You might find junta standing next to you at the table waiting for you to finish and leave! To avoid/minimize this, see if you can get a table that’s deep inside rather than close to the door.
The food is still very good. The chai is free and so are the onions, chillis, pepper and chutneys.