proc mvar in file ~/tcl/rtp/session-rtp.tcl

[Kamil Sarac <ksarac@cs.ucsb.edu>]

Hello all,
Can anyone tell me what exactly the  "proc mvar" below does?

proc mvar args {
    upvar self _s
    uplevel $_s  instvar $args
}

Thanks,

Kamil Sarac.