Specifies whether an external procedure should be invoked as persistent, single-run, or singleton.

Data type: CHARACTER

Access: Readable/Writeable

Applies to: Call object handle

This attribute holds a value of "PERSISTENT", "SINGLE-RUN", or "SINGLETON" (not case sensitive), and defaults to the Unknown value (?). Setting this attribute to any other value will result in a run-time error.

When a dynamic invocation returns and PROCEDURE-TYPE is set to "PERSISTENT", the IN-HANDLE attribute will hold a handle to the running persistent procedure. When a dynamic invocation returns and PROCEDURE-TYPE is set to "SINGLE-RUN" or "SINGLETON", the IN-HANDLE attribute will hold a handle to the single-run or singleton procedure.

Setting PROCEDURE-TYPE to "PERSISTENT"" will automatically set the PERSISTENT attribute to TRUE. Likewise, setting the PERSISTENT attribute to TRUE will automatically set PROCEDURE-TYPE to "PERSISTENT". Setting the PROCEDURE-TYPE and PERSISTENT attributes to conflicting values, e.g., PERSISTENT as TRUE and PROCEDURE-TYPE as "SINGLE-RUN", will result in a run-time error.

See also

IN-HANDLE attribute, PERSISTENT attribute