X/open portability guide / 
X/Open Co. 
 - Englewood Cliffs, N.J. :  Prentice-Hall,  1989. 
 - v. :  ill. ;  24 cm. 
<br/><br/>Contents: v.1. X SI commands and utilities. V.2. X SI system interface and readers. v.3. X SI supplementary definitions. v.4. programming languages. v.5. Data management. v.6. Window management. v.7. Net working services. 
<br/><br/><label>ISBN: </label>0136858198 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Software compatibility.<br/>UNIX (Computer operating system)