In addition to codemastr's suggestion (F2 in VB as long as you've referenced what you want to use), you can also get to such a tool in Word, Excel, PowerPoint (Alt-F11, then F2).
Bear in mind, however, that not all objects revealed there are COM objects. For instance, if you are playing with ADO (ActiveX Data Objects) to play with a database, you can't instantiate a Field object, even though there is such an object in the ADO object model.
/comopen dbMyDatabase ADODB.Connection
/comopen rsMyTable ADODB.RecordSet
/comopen fldTest ADODB.Field
The first two will work and are usable; the third one doesn't work because, although Field is an object, it's not a COM object.