TsctlSystemEchoNumberDesc

This function returns the number that was passed. This is mainly for test purposes. For instance, the tsctl client will automatically perform lookups on strings passed where numbers were expected; this function can be used to see what the lookup is returning without actually using it for anything.

This differs from calling the System MapLookup function because the tsctl client supports adding lookups with the "+" character. Therefore you can determine the final result even with non-trivial lookups.