When you check a checkbox you can examine it's property by looking at it's value
i.e checkbox.value = true
since you are using multiple checkboxes on a single user form i would suggest running something like this
Code:
Private Sub CmdAll_Click()
Dim aControl As MSForms.Control
'Check which box is checked
For Each aControl In Me.Controls
If TypeOf aControl Is MSForms.CheckBox Then
'check to see if checkbox is checked
If aControl.Value = True Then
'put your code here
End If
End If
Next aControl
End Sub
this examines the property of all the checkboxes on your form,
HTH
David