I think you are asking about using the HTML interface rather than the Harmony client.
Status 80-87 to turn On valves 1-8 results in 0x40 cmd1 with 0-7 cmd2 values
Status 0-7 to turn Off valves 1-8 results in 0x41 cmd1 with 0-7 cmd2 values
Status 20 turn On Program 1 results in 0x42 cmd1 with 0 cmd2 value
Status 28 turn On Program 2 results in 0x42 cmd1 with 1 cmd2 value
Status 30 turn On Program 3 results in 0x42 cmd1 with 2 cmd2 value
Status 38 turn On Program 4 results in 0x42 cmd1 with 3 cmd2 value
The EZFlora command set is available in the Downloads section under Command Sets – EZFlora
EDIT: added Status values for turning on Programs 1-4