A system, comprising: an operating system; an application; and an action input module implemented at least partially in hardware and configured to: provide, via the OS or the application, a digital ink user interface that is associated with the application and that can receive a digital ink stroke made through a stylus, the digital ink stroke: received through a display that is capable of receiving input from the stylus; and received over the digital ink user interface, the digital ink user interface configured to receive the digital ink stroke and present, in real time, a visual representation of the digital ink stroke, the application configured to interpret the digital ink stroke as content input; determine, based on a proximity of the digital ink stroke to, intersection of the digital ink stroke with, or chronological immediacy of the digital ink stroke to a prior-received digital ink stroke currently presented in or over the digital ink user interface, that the digital ink stroke and the prior-received digital ink stroke represent a multi-stroke gesture and that the multi-stroke gesture is associated with an action input associated with the application; and provide the action input to the application effective to cause the application to receive and react to the action input. an operating system; an application; and an action input module implemented at least partially in hardware and configured to: provide, via the OS or the application, a digital ink user interface that is associated with the application and that can receive a digital ink stroke made through a stylus, the digital ink stroke: received through a display that is capable of receiving input from the stylus; and received over the digital ink user interface, the digital ink user interface configured to receive the digital ink stroke and present, in real time, a visual representation of the digital ink stroke, the application configured to interpret the digital ink stroke as content input; determine, based on a proximity of the digital ink stroke to, intersection of the digital ink stroke with, or chronological immediacy of the digital ink stroke to a prior-received digital ink stroke currently presented in or over the digital ink user interface, that the digital ink stroke and the prior-received digital ink stroke represent a multi-stroke gesture and that the multi-stroke gesture is associated with an action input associated with the application; and provide the action input to the application effective to cause the application to receive and react to the action input. provide, via the OS or the application, a digital ink user interface that is associated with the application and that can receive a digital ink stroke made through a stylus, the digital ink stroke: received through a display that is capable of receiving input from the stylus; and received over the digital ink user interface, the digital ink user interface configured to receive the digital ink stroke and present, in real time, a visual representation of the digital ink stroke, the application configured to interpret the digital ink stroke as content input; received through a display that is capable of receiving input from the stylus; and received over the digital ink user interface, the digital ink user interface configured to receive the digital ink stroke and present, in real time, a visual representation of the digital ink stroke, the application configured to interpret the digital ink stroke as content input; determine, based on a proximity of the digital ink stroke to, intersection of the digital ink stroke with, or chronological immediacy of the digital ink stroke to a prior-received digital ink stroke currently presented in or over the digital ink user interface, that the digital ink stroke and the prior-received digital ink stroke represent a multi-stroke gesture and that the multi-stroke gesture is associated with an action input associated with the application; and provide the action input to the application effective to cause the application to receive and react to the action input.