A system and method providing for collaborating among a plurality of users each user at a respective associated one of a plurality of computing appliances. It has been found that cationic surfactants such as ethyl-N\u03b1-lauroyl-L-arginate HCl and its salts are effective acaricidal agents. The first step computes TDOA for each microphone pair, and the second step combines these estimates. The housing includes a bearing supporting the drive shaft and a receiving portion receiving the engaging portion. The method further includes updating the value for noise and the slack variable given the hyperplane, and determining the hyperplane to be the boundary for binary classification of the data set upon determining a termination criterion to be met, wherein elements of the data set are classified according to the boundary. The method includes multidirectional deformation of an ingot to form a mill form having a preferred average grain size of about 100 microns or less andor a texture substantially void of textural bands.