The three-input keypad lock allows to distinguish the sequence of three different inputs (A = 780 nm light, B = acid, and C = base addition) and the sequence BCA unlocks high absorption in the NIR 900 nm spectral region (see Supporting Information Figures ). An advanced version of this behavior is achieved with a four-input keypad lock setup, which allows to distinguish the sequence of four inputs A = 780 nm light, A = 565 nm light, C = acid, and D = base addition (Figure ). Only three out of 24 possible sequences unlock absorption at 590 nm delivering a heightened level of specificity as compared to the three-input keypad lock (distinguishing one out of six possible sequences). In conclusion, we present here aggregation induced bathochromism (AIB) for shifting the lightresponsiveness of molecular photoswitching beyond the 1000 nm mark into the SWIR region of the spectrum. For this concept we use the PAT chromophore, which in dissolved form can be photoisomerized with NIR light up to 830 nm. By changing its solubilizing groups it was possible to evoke a distinct new behavior where the stable E isomer is aggregating, concomitantly shifting the absorption far beyond 1000 nm. The aggregated PAT could be photoisomerized with 1020 nm SWIR light into the metastable Z isomer while at the same time dissolving the aggregates. Orange light photoisomerizes the Z isomer back to the E isomer reforming the aggregates and making the whole process fully reversible. We further showed that pH changes represent an independent signaling system to switch reversibly between E isomer aggregates and dissolved E isomer and high concentration of acid lead to an even more red-shifted and pronounced absorption profile. Integrating the two signaling systems light and pH we could apply this multi-responsiveness in advanced molecular logic operations. With these results it is now possible to reliably enter the SWIR absorption region for reversible photoswitching and we are sure that this AIB-based concept will open the door for a plethora of advanced and super-low energy responsive photoswitch applications in the near future.