System and method for direct call of a target function by a start function by means of a processor with a memory management unit (MMU) in a computer operated by an operating system. A first task with a first memory context and with the staff function as a component executes the start function to perform a context switch from the first memory context into a second memory context. The target function is a component of a second task with the second memory context. The target function is executed in the second memory context, and the context switch is reversed to return to the first memory context after executing the target function.