VAPOR is a networking infrastructure that allows software developers for TI graphing calculators to host software and servers for online calculator games and allows calculator gamers to easily install or update the software needed to play those games. Simply send the VAPOR.8XP TI Program File to your Texas Instruments TI-84+ CE graphing calculator that also has the Serial and USB libraries installed to use the features of this program.
Yes, VAPOR is a Steam-style program for your calculator. Come at me, bro.