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process* COMMANDLINEprocedure
process* COMMAND ARGUMENT-LIST #!optional ENVIRONMENT-ALISTprocedure

Like process but returns 4 values: an input port from which data written by the sub-process can be read, an output port from which any data written to will be received as input in the sub-process, the process-id of the started sub-process, and an input port from which data written by the sub-process to stderr can be read.