Knowing about undocumented features of DOS allows programmers to dramatically speed up the  execution time of their programs. Undocumented DOS through C reveals the undocumented or difficult     to –find  features o critical MS- DOS data structures in MS.DOS explained in detail, followed by C   source code for putting this knowledge to use.    

This book includes :

• Detailed coverage of List .Job File Table,Arena Headers ,CDs and DPB .
• Tracing and manipulating the DPB,Buffer and the Device chains.
• Memory organisation o DOS including Upper Memory Blocks and DOS subsegments.
• Writing TSRs using swappable Data Area.
• Installing /Deinstalling TSRs
• An independent chapter on putting Undocumented DOS to real life use.