QBasic 1.1 Commands List: AS Keyword

Description / Parameter(s)
Specifies a variable type when used in the COMMON, DECLARE, DEF FN, DIM, FUNCTION, REDIM, SHARED, STATIC, and SUB statements.
Specifies an element type in a user-defined data type when used in the TYPE statement.
Assigns a file number to a file or device when used in the OPEN statement.
Specifies a field name when used in the FIELD statement.
Specifies a new file name when used in the NAME statement.