bas7qck.hlp (Table of Contents; Topic list)
ISAM Naming Conventions
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ISAM names use the following conventions:
 
    ■ They have no more than 30 characters.
    ■ They use only alphanumeric characters (A-Z, a-z, 0-9).
    ■ They begin with an alphabetic character.
    ■ They include no BASIC special characters.
      See Fundamental Building Blocks: Character Set