⍝ Now lets trace a simple form 
⍝
Test
OnLoaded←'Test'
⍝
⍝ We Open two more browsers...
⍝ ... To simulate three Users
⍝
User1←#.WS.GetUser 1
User2←#.WS.GetUser 2
User3←#.WS.GetUser 3
⍝
⍝ Stepping through Users 1 and 2
⍝
User1.f.grd.Values
⍴User3.f.grd.Values
User2.f.cb.Items
User2.f.cb.Items,←⊂'2019'
⍝
⍝ User2 combo box changed...
⍝ ...Other Users unchanged
⍝
⍝