C Useful

Process

List Active Processes And Print Results (stdout)
Execute A Command And Print Results (stdout)
Execute A Command And Wait Until The Child Process Is Finished

List Active Processes And Print Results (stdout)

( man fopen | man fread | MSDN CreateToolhelp32Snapshot | MSDN QueryDosDevice )

Execute A Command And Print Results (stdout)

( man popen )

Execute A Command And Wait Until The Child Process Is Finished

( man fork | man getpid | man execv | man waitpid | MSDN CreateProcess | MSDN WaitForSingleObject | ... )