24. The method of claim 23 , further comprising: producing a first candidate sub-word unit upon triggering the sub-word unit recognition by the handwriting recognition engine; and outputting the first candidate sub-word unit.
23. A method for triggering sub-word unit recognition in Devanagari script comprising: drawing one or more strokes followed of a desired sub-word unit in the Devanagari script using a stylus on a touch screen, wherein one of the drawn one or more strokes is a head-line stroke and is a last drawn stroke of the desired sub-word unit in the Devanagari script; inputting an associated data of each of the drawn one or more strokes via the touch screen into a handwriting recognition engine; comparing each drawn stroke to a horizontal reference line; dynamically computing stroke characteristics of each drawn one or more strokes based on the comparison, wherein, in dynamically computing stroke characteristics, the stroke characteristics are selected from the group comprising aspect ratio and slope; determining the head-line stroke in the drawn one or more strokes followed of the desired sub-word unit that can be used to trigger the sub-word unit recognition based on the computed stroke characteristics, wherein the head line stroke is drawn substantially parallel to the horizontal reference line; and triggering sub-word unit recognition for the drawn one or more strokes upon determining the head-line stroke by the handwriting recognition engine.