A:Answer Hello,
Thank you for your interest in the S2240T 21.5" touchscreen monitor! As it turns out, the only current way to "chain" monitors is by using DisplayPort v1.2 (or Thunderbolt) connections between the monitors. Also, the monitors have to have two DP or Thunderbolt ports on each, in order to allow for chaining. This is not currently a very viable option but will become more commonplace when the next few generation's monitors come out. This monitor does not have DP or Thunderbolt ports. Most laptops have two video out ports, which allow for two external displays or one external display + the laptop screen. I do not believe any laptop Dell makes supports three monitors at this time.
Hope this helps!
JonathanNforDell