Switch Directives 

     Switch Directives toggle the compiler between different compilation
     methods.  There are twelve Switch Directives; they are:

  {$A+} / {$A-}     Switches between Word and Byte alignment of variables
  {$B+} / {$B-}     Enables/Disables Boolean `Short Circuit' Evaluation
  {$D+} / {$D-}     Enables/Disables generation of debug information
  {$E+} / {$E-}     Enables/Disables 8087 Emulation routines
  {$F+} / {$F-}     Forces/Does not force Far Calls
  {$I+} / {$I-}     Enables/Disables I/O checking
  {$L+} / {$L-}     Enables/Disables generation of local symbols
  {$N+} / {$N-}     Enables/Disables use of the 8087 math chip
  {$O+} / {$O-}     Enables/Disables overlay code generation
  {$R+} / {$R-}     Enables/Disables code generation for range checking
  {$S+} / {$S-}     Enables/Disables stack overflow checking
  {$V+} / {$V-}     Enables/Disables variable parameter string checking