ALTD()
 Invoke the CA-Clipper debugger
------------------------------------------------------------------------------
 Syntax

     ALTD([<nAction>]) --> NIL

 Arguments

     <nAction> defines what action ALTD() performs when invoked.  The
     following is a complete list of <nAction> values and their actions:

     ALTD() Actions
     ------------------------------------------------------------------------
     Argument     Action
     ------------------------------------------------------------------------
     None         Invokes the debugger if it is enabled
     0            Disables Alt+D
     1            Enables Alt+D
     Other        No action
     ------------------------------------------------------------------------

 Returns

     ALTD() always returns NIL.

 Description

     ALTD() performs differently depending on its argument as shown in the
     table above.  For more information on using the debugger, refer to
     "CA-Clipper Debugger-CLD.LIB" chapter in the Programming and Utilities
     Guide.  Also refer to the "Debugging Your Applications" chapter in the
     Workbench User Guide.

 Examples

     .  This example demonstrates a series of manifest constants that
        can be used as arguments for ALTD() before invoking the debugger
        programmatically:

        #define ALTD_DISABLE      0
        #define ALTD_ENABLE      1
        //
        ALTD(ALTD_ENABLE)

 Files   Library is CLIPPER.LIB.