1. A method for concurrently executing a first (DFSORT) and a second (EFS) cooperating sequential process on a computing system, said first process for permuting a string of first records with first collating characteristics in response to control statements executable by said first process, said control statements being executable by said first process in response to said first records, said second process including means for altering control, statements, said method comprising the steps of: while said computing system is under control of said first process, inputting a set of control statements and an input string of records, said records including second records with second collating characteristics, said set of control statements including a subset of control statements executable only in response to said second collating characteristics; transferring control of said computing system to said second process; modifying the control statements of said subset of control statements to a form executable by said first process in response to records with said first collating characteristics; adding counterpart first collating characteristics to said second records; transferring control of said computing system to said first process; and permutatively processing said input string into an output string including said second records by executing said modified control statements in response to said added counterparts first collating characteristics.