IDF allows you to specify addresses by placing the cursor in a field on the screen. IDF determines an address in the following ways:

• If the cursor is in a GPR, the contents of that displayed register are used. If the cursor is in an AR, the DUMP and SET ALET commands use the ALET in that AR and the DUMP command uses the address in the associated GPR.
• If the cursor is in the PSW, the address part of the PSW is used.
• If the cursor is in the hex part of a disassembled instruction, then:
  • All commands except DISASM and OPEN DISASM use the address of the halfword containing the cursor.
  • If the field containing the cursor is both the first field disassembled and a branch instruction, the DISASM and OPEN DISASM commands use the effective address of the branch instruction. Otherwise they behave like other commands.
• If the cursor is in a dump field, then:
  • All commands except DUMP and OPEN DUMP use the address of the beginning of the hexadecimal field containing the cursor, or the exact address of the character on which the cursor is positioned if it is in the character portion of the display.
  • If the field is both a fullword field and the first field in the dump display, the DUMP and OPEN DUMP commands use the contents of the field. Otherwise they behave like other commands.
• If the cursor is in the protected portion of a disassemble or dump line the starting address of the line is used.