Furniture accessories extend the carts, stands, and workstations already in service: shelves and equipment trays that add a laptop or camera platform to a cart, attachment kits that bolt storage or charging capacity onto an existing stand, and the brackets and hardware that adapt a general-purpose fixture to a specific job. They are how one cart platform serves ten different roles.
Compatibility is by product family - most shelves and attachments fit one manufacturer's mounting system, so order against the exact cart or stand model on the floor, not the general look of it. Weigh what the accessory will carry honestly, including cables and power supplies, and check the load rating of both the accessory and the fixture it joins. Buying accessories from the same family as the fixture keeps the assembly rated, stable, and reconfigurable later. COLAMCO quotes carts, stands, and their accessories together for business, government, and education deployments.