Through the ASCRE macro, you can pass up to 254 bytes of data in a parameter string to a program in the new address space. The ASPARM parameter identifies the address of the parameter string. A program in the new address space can use the ASEXT macro to obtain a copy of that parameter string. The ASEXT macro returns the address of the copy in register 1. Example of creating and deleting an address space contains an example of a program in the new address space retrieving a copy of the parameter string.