These functions create, retrieve and delete substitution variables and return information about them.
| Function | Description |
| EssCreateVariable() | This function creates a new substitution variable or modifies an existing substitution variable if the variable name already exists with the identical server, application, and database values. |
| EssDeleteVariable() | This function deletes a substitution variable. |
| EssGetVariable() | This function retrieves the value of a substitution variable. |
| EssListVariable() | This function lists all substitution variables that conform to the input criteria. |