Page 0-22 (decimal) is used to select individual fan, temperature sensor, or remote voltage connected to the ADC. For control associated with each page, refer to Table 9 in the datasheet (Rev 3 8/12). Once selected, all control commands are for that page only.
To select a page, send slave address, followed by page command, and then the data (page number). For example, by sending Start condition--Slave address--Page command (0x00) --data (0x00), Page 0 is selected. Page 0 is associated with fan connnected to PWM 0. You can then use commands to configure the fan. For commands available for Page 0, refer to Table 1 of the datasheet. For example, 0x3A (FAN_CONFIG_1_2) command can configure the fan. If you wish to control other fans, use the Page command to select the fan, then use the control commands to configure it.