An input device comprises a touch sensitive sensor operative to sense finger touch, a detection unit controllable to apply a single touch detection method over at least one area of the touch sensitive sensor and a multi-touch detection method over at least one other area of same touch sensitive sensor, and a controller operative to set the areas of single touch and multi-touch detection. The system utilizes a specially designed bio-disc and an optical reader attached to a computer to deliver a wide range of tests, such as clinical laboratory diagnostic tests, biological warfare agent detection, forensic DNA tests, and food and water contamination tests, to a remote location. The volatile solvent may comprise a mixture of water with a C1-C5 alcohol and the non-volatile solvent may comprise a polyhydric alcohol and optionally a glycol. A second intermediate member is configured to selectively close the second storage area opening.