1. A method for translating statements in a computer program, comprising: processing a mnemonic in the computer program having a user defined definition and a translator definition; interpreting the mnemonic according to the user defined definition in response to previously processing a mnemonic command specifying the mnemonic and the user defined definition; and interpreting the mnemonic according to the translator definition in response to previously processing a mnemonic command specifying the mnemonic and the translator definition.