SPAWN [ dcl_command ]
SPAWN with parameters concatenates the parameters to form a DCL command. creates a subprocess, and executes the DCL command in the subprocess.
SPAWN with no parameters creates a subprocess in which a series of DCL commands may be executed. Use LOGOUT to return to ICL.
In most cases DCL is a faster alternative to SPAWN as the subprocess does not have to be created for each new command. However SPAWN will do a few things which are not possible under DCL. SPAWNed commands will prompt for their parameters, for example, whereas commands issued using DCL will not.
ICL The Interactive Command Language for ADAM