Creating Visual FoxPro Names
Data containers and some parameters to commands and functions require a name. When you create a name in Visual FoxPro, apply the following rules:
Use only letters, underscores, and numbers.
Begin the name with a letter or underscore.
Use 1 to 128 characters, except for field names in free tables and index tags — those can be 10 characters at most.
Avoid words reserved by Visual FoxPro.
File names follow your operating system's conventions.
See Also
Concepts
Macro Substitution (Visual FoxPro)