mapping insert to shift-insert

how can i map <inset> key to work as <Shift-Insert>

i tried the following mapping

nmap <insert> <S-insert>

it doesn't seem to be working, is it even possible ?

basically i wanna copy text from one screen session to
other session inside a putty, without using shift-insert
to paste. in putty, i use mouse to select a text which
needs to be copied and i go to the target session
i press <Shift-insert> to paste the text, using shift
is very tedious and i want to avoid that, hence the need
for mapping.

cheers
sibnad

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