An alarm display and interface tool for use in a process control system receives and displays different categories of alarms, including for example, device alarms and hardware alarms as well as traditional process alarms, on a single display to enable an operator or other user to view and have access to these different categories of alarms. In the seam welding warpage prevention method for welding a plurality of workpieces W1 and W2 that are not uniform in thermal contraction with respect to an energizing direction, the workpieces W1 and W2 are clamped with a pair of roller electrodes 23 and 33 while applying current. Also, a memory-card-user-information-acquisition unit acquires the main-memory-card-user information from the memory card that identifies the main user of the memory card. The electrical cord is positioned between the prong and the base such that the prong and base cooperate together to secure the electrical cord such that the electrical plug is not unintentionally disconnected from the electrical outlet. The filling system can also include a spatula. The method includes applying edge enhancement to data D of interest if the difference between the data D of interest and data D in a view adjacent to the view corresponding to the data D is large, while smoothing is applied to the data D of interest when the difference is small.