In Scalar Prism, the > symbol in the line-number region points to the next line to be executed; see " Using the Line-Number Region". In a message-passing program, there can be multiple execution points within the program. MP Prism marks all the execution points for the processes in the current set by a > in the line-number region (or a * if the current source position is the same as the current execution point). Shift-click on this symbol to display a pop-up window that shows the process(es) for which the symbol is the execution pointer.