Using Adafruit CircuitPython or Arduino libraries, the user can create a frame buffer with what pixels they want to have activated and then write that to the display. The eInk Feather Friend comes with a 256Kilobit (32Kilobyte) SRAM chip. That means the user can control up to a 4.2" 300x400 tri-color display (300x400 x 2 colors/8 bits-per-byte = 30KB). This chip shares the SPI port the eInk display uses, so the user only needs one extra pin. The user can use the SRAM to set up whatever the user wants to display, then shuffle data from SRAM to eInk when they are ready. The library from Adafruit does all the work for the user. The user can just interface with it as if it were an Adafruit_GFX compatible display. If it is preferred to use the chip, Adafruit libraries will automatically use the microcontroller/microcomputer internal RAM.