bang 

In left inlet: Performs the comparison with the numbers currently stored. If there is no argument, != initially holds 0 for comparison. 
int 
input [int]

In left inlet: The number is compared with the number in the right inlet. If the two numbers are not equal, != outputs 1. If they are equal != outputs 0. 
(inlet1) 
comparisonvalue [int]

In right inlet: The number is stored, to be compared with a number received in the left inlet. 
float 
input [float]

Converted to int before comparison, unless != has a float argument. 
set 
setinput [int]

Sets the number to be compared without causing output (bang will output it). 
list 
input and comparisonvalue [list]

In left inlet: Compares first and second number, outputs 1 if they are not equal, 0 if they are equal. 