Please try something like this (you should avoid using spaces in the field and object names):
Code:
'Add new client form
Private Sub Record_time_button_Click()
DoCmd.OpenForm "Record time 2", acNormal, , , acFormAdd, acWindowNormal, Me.txtClientName ' txtClientName is the name of the textbox control on the Add New Client form "Client name"
End Sub
'Record time 2 form
Private Sub Form_Open(Cancel As Integer)
Me.ClientName=me.OpenArgs 'Me.ClientName refers to the textbox control on this form that is supposed to get the client name
'You could also simply try to reference the control directly
'Me.ClientName=Forms![Add New Client]![txtClientName]
End Sub
Cheers,