CLIST ICQSPC00 enables an application program to access the TSO/E space management service. The space management service ensures that a specified data set has adequate free space for additional data. If the specified data set does not exist, ICQSPC00 can allocate it. You can invoke ICQSPC00 from within a program that runs under ISPF, or by typing "tso %icqspc00 dsname optional parameters" on the command line in an ISPF environment.