To store a value to the registry, use the SaveSetting command in VBA.
SaveSetting appname:="MyApp", Section:="Startup", Key:="Top", setting:=75
This statement will make a new Key named "MyApp", a sub key named "Startup", a String value named "Top" with a value of "75" in the following location:
HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
To view the change to the registry, click on the Window Start Button and click the Run... option. Enter: Regedit and click OK. The registry will open, and you can browse the tree to locate the entry. (Don't delete or modify anything, as it may have detrimental effects on your system!)
To retrieve your custom settings, you can use the GetSetting or the GetAllSettings commands.
To delete the registry keys that you made, use:
DeleteSetting "MyApp", "Startup"
See the Microsoft Access Help File for more information.