Dynamic process management is a much-needed feature for applications and tools development in Beowulf cluster environment. A welldefined and efficient dynamic process management in cluster middleware layer can simplify the programming task of parallel tool developers. This paper presents the design and implementation of dynamic process management in a cluster middleware called KSIX. KSIX provides a rich set of system call that handles rapid process creation, termination, and remote signal delivery. Moreover, KSIX also handles the correct redirection of standard input, standard output and standard error of process or group of processes. The experiment has been conducted and the results are presented to illustrate the performance of our implementation.