# NOT RUN {
## the next command checks whether the file 'data.rda'
## or the file 'data.rda.lock' exists. If so, a positive
## value is returned. If not, the file 'data.rda.lock'
## is created and the value 0 returned.
FileExists("data.rda")
## the next command deletes the file 'data.rda.lock'
LockRemove("data.rda")
# }
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