This keyword can only be used with text properties. It populates a property with the value of “GUID” property. This text property can then be used as a key property instead of the actual GUID property. The ASGUID property should be read only. When you re-open the definition the ASGUID property will be filled in.
Example
RENAME DEFINITION "User 1" to "MyDef"
DEFINITION "MyDef"
{
PROPERTY "MyProp"
{KEY EDIT Text LENGTH 100 ASGUID READONLY}
Property "HIYA"
{EDIT Text Length 145}
}
The example above indicates that the new definition “MyDef” will show the dialog Dictionary Object – MyDef. The property “MyProp” becomes read‑only, and was automatically populated with the GUID of the definition.