In the Accounts Payable module, vendors are parties for whom you will print checks. This includes those persons or individuals that you purchase items or services from. These vendors will be assigned standard ID Numbers, as would any person or organization on the system. According to the system, vendors can even be students or other persons to whom you are printing checks, even though they are not really vendors. However, in order for the Accounts Payable system to write a check for them without requiring them to be entered on the Vendor Master table, you must use a "catchall" vendor ID Number of all 9s (999999999).