Thank you for the suggestion, however it yeilded only partial success. It appears that changes to a variable are not reflected in the control until a form refresh is done.

Side note: initial attemps using the function solution were unsuccessful, there appeared to be residual flags on the control which still caused the #name error to occur, until I deleted the control and created a new one.

I also tried to generalize...

Is it possible to cause a contents of a variable defined in a Module as public, to be retrieved by a control(textbox ) in the trailer of a bound single view Form.
Where desired data is not associated with the Table. bound to the Form
The variable's content is an application calculation.

Environment:
Windows Vista Ultimate, Access 2007

object: Module1
public varname as double

...

Is it possible to cause a contents of a variable defined in a Module as public, to be retrieved by a control(textbox ) in the trailer of a bound single view Form.
Where desired data is not associated with the Table. bound to the Form
The variable's content is an application calculation.

Environment:
Windows Vista Ultimate, Access 2007

object: Module1
public varname as double

...