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An ENDKEY condition generated by i.e. F4 while an update is in progress will update the SCREEN-VALUE and INPUT function. See this for an example:

def var i as int.
def var ch as char.
def var d as date init today.

i = 12345.
ch = "abcdef".

display i ch d with frame f1.

do on endkey undo, leave:
   update i ch d with frame f1.
end.

message ch entered input ch ch:screen-value.
message d entered input d d:screen-value.
message i entered input i i:screen-value.

enter "1" for i, "a" for ch and "11/ / " for d, then press F4/ENDKEY The result will be this:

no a a
no 11/  / 11/  /
no 1 1

The fix will need to send the frame's ScreenBuffer to the server side, enclosed in the raised condition (or maybe let the server-side explicitly retrieve the screen buffer from the client-side, if a condition was raised).