1. Computer for authenticating a user comprising: processor; computer readable storage medium accessible to the processor and bearing instructions embodying logic comprising: permitting a user to select a first input mode with associated first input parameter; permitting the user to select a second input mode with associated second input parameter, the first input mode being different from the second input mode; and executing a behavior of the computer only responsive to a determination that subsequent inputs of the first and second parameters are received in the first and second input modes in a sequential order of input modes specified by the user, wherein the first input mode is selected from the group of input modes consisting of touch screen input, or accelerometer input, or position sensor input and the second input mode is selected from the group of input modes consisting of text keyboard sequence, touch screen input, biometric sensor input, voice input, image recognition, accelerometer input, position sensor input, and wherein the user specifies the modes and sequential order using a user interface.