>>How can I check in a program the width of a table field?
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>FSIZE(cFieldName [, nWorkArea | cTableAlias] | cFileName)?

remember:

The current setting of SET COMPATIBLE determines if FSIZE( ) returns the size of a field or a file. If SET COMPATIBLE is set to OFF or FOXPLUS (the default), FSIZE( ) returns the size of a field. If SET COMPATIBLE is set to ON or DB4, FSIZE( ) returns the size of a file.