Registry reading

To read a registry entry, I used the following code:
m_MultiplyBy10 = GetSetting("MyApp", "MySection\Data", "MultiplyBy10",
"CC,DD")

I would like to loop thru all the keys in a registry entry, how can I do
that ?
For ex, for the following entries, I would like to programmatically loop
thru all the keys under MyApp\MySection\Data, how can I do that ?
[HKEY_CURRENT_USER\Software\VB and VBA Program
Settings\MyApp\MySection\Data\A]
"Operator"="/"
"OperatorValue"="10"
"Format"="#####"

[HKEY_CURRENT_USER\Software\VB and VBA Program
Settings\MyApp\MySection\Data\B]
"Operator"="*"
"OpeatorValue"="10"
"Format"="######"

[HKEY_CURRENT_USER\Software\VB and VBA Program
Settings\MyApp\MySection\Data\C]
"Operator"="*"
"OpeatorValue"="100"
"Format"="######"


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