Final answer:
The CSOKI button in question is used to check the availability of a product, like special printer ink, in different stores, by searching through inventory or using a product locator function.
Step-by-step explanation:
The button in CSOKI you are asking about is most likely the inventory search or product locator feature. This function allows users to determine the availability of a specific product, such as a special printer ink, at various stores. To use this feature, typically you would first select the product you are looking for, and then the system will prompt you to enter details such as your location. Subsequently, it displays a list of stores that carry the product, along with price and availability information. Remember that the exact name of the button can vary depending on the interface of the CSOKI system you are using.