ConvertApply(f,T1,...,Tm) -- a format item for communication with the engine that specifies that format items T1, ..., Tm should be applied to the bytes received from the engine, and then the function f should be applied to the sequence of results.
See convert.
Code:
-- ../../../Macaulay2/m2/convert.m2:6 ConvertApply = x -> x -- (f,T1,...,Tm)