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Form1!Command1.Value = -1 ' Or True
' To disable or enable all the controls on a form, use the Controls collection.

' Example:

Dim i
'Loop through all form controls

For i = 0 To Form1.Controls.Count - 1

'Disable each control

Form1.Controls(i).Enabled = False

Next
You can call a command button on another form via the button's
Value property. This will invoke Command1_Click on Form1