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The process of [[bind  declare runtime expression string variable .htm|BIND]] ing a field, procedure or expression allows the entity be used in an expression string for either the [[evaluate  return runtime expression string result .htm|EVALUATE]] procedure or a [[view  declare a  virtual  file .htm|VIEW]] structure's [[filter  set view filter expression .htm|FILTER]] attribute.

This template interface allows you to specify that a BIND is generated for the fields, procedures, and expressions you designate. The template interface generates the proper syntax for each of these entities.

On the **Fields** tab, you may insert, change or delete a field to be BINDed by selecting the **Developer Defined** tab, and selecting the appropriate button. You will be presented with an ellipsis that will allow you to select any variable defined within your application. The **Template Defined** tab displays any variables that have already been BINDed by other templates. You should always check this tab to verify a list of variables already BINDed.

On the **Procedures** tab, you may insert, change or delete a procedure to be BINDed by selecting the **Developer Defined** tab, and selecting the appropriate button. You will be presented with a drop list that will allow you to select any procedure name currently defined within your application. You can also add new procedure names not yet defined here. The **Template Defined **tab displays any procedures that have already been BINDed by other templates. You should always check this tab to verify a list of procedures already BINDed.

On the **Expressions** tab, you may insert, change or delete a name to be BINDed to an expression by selecting the appropriate button.

| **Name** | Enter a string value to use as the name to be used to identify the BINDed expression. |
| **Expression** | An expression is a mathematical formula containing any valid combination of variables, functions, operators, and constants. Enter a valid [[expressions.htm|expression]] to be BINDed. Example: (TODAY() ' 1) |
|  | Press the "**E**" button to call the Expression Editor. This dialog is used to help you construct syntactically correct expressions to use in the **Expression **prompt. |