Allocate and Alter
For each writeback method and for reallocation you can specify allocation or alteration of values.
Allocate replaces existing values. For example, if a cell contains 1 and you write 2 to it using Allocate, the cell value becomes 2.
Alter amends existing values by the value you enter. For example, if a cell contains 1 and you enter 2 using Alter, the cell value becomes 3.
Allocate splasher commands are prefixed with the hash (#) symbol.
Alter commands are prefixed with ampersand (&).
In the Write Back dialog, the options and equate to Allocate and Alter respectively.