C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
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_dos_setdrive
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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _dos_setdrive routine uses system call 0x0E to set the current
     default drive to the <drive> argument: 1=drive A, 2=drive B, and
     so on. The <numdrives> argument indicates the total number of
     drives in the system. If this value is 4, for example, it does not
     mean the drives are designated A, B, C, and D; but only that four
     drives are in the system.
 
     Return Value
 
     There is no return value. If an invalid drive number is passed,
     the function fails without indication. Use the _dos_getdrive
     routine to verify whether the desired drive has been set.
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