Lenivecда, верно, но использование восклицательного знака это не объясняет :)
авторThere are three ways to refer to an object in a collection. The fastest way is to provide the name of the collection followed by the name of the object to which you are referring, as shown in the following examples:

Forms!Employees
QueryDefs![Current Product List]

Use the ! operator to separate the name of the collection from the name of the particular object within it. Also, if the name of the object contains spaces, you must enclose it in brackets.

In most cases, you’ll know the name of the object to which you’re referring, and you should use this syntax. Occasionally, however, you may not know the name of the object until the procedure is running. In this case, you can use a string variable to represent the name of the object. In the following examples, strFormName and strQueryDefName are string variables that contain the name of a Form object and a QueryDef object.

Forms(strFormName)
QueryDefs(strQueryDefName)

If the value of strFormName is "Employees" and the value of strQueryDefName is "Current Product Name", then the previous example is equivalent to the following lines of code:

Forms("Employees")
QueryDefs("Current Product Name")

You can also refer to an object in a collection by its index number. Like the elements of an array, each object in a collection has an index number that refers to its position in the collection. The following examples use the index number to refer to a particular object in a collection.

Forms(0)
QueryDefs(1)
MSDN