A null-delimited string set is a way to pass a series of any number of strings as a single string pointer. Each string has a terminating '\0' character, and a double '\0' indicates the end of the string. For example, the set "apple," "pear", "grape" would be represented as follows:

'a', 'p', 'p', 'l', 'e', '\0', 'p', 'e', 'a', 'r', '\0', 'g', 'r', 'a', 'p', 'e', '\0', '\0'