A UDF is the user-written equivalent to a KiXtart function. It aspires to mimic the input and output behavior of KiXtart functions including the way error codes are returned.
Generally, a UDF is written to perform a specific task.
UDFs are delimited by the FUNCTION-ENDFUNCTION commands and should include a comment header providing usage information modeled after the function information provided in the KiXtart Manual.
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There are two types of vessels, submarines and targets.
