File with .HBK extension contains data specifing the order of the individual files in the Mathcad electronic book as the reader goes through it. Such procedure is very similar to the book binding on a physical book? HBK files are stored in Mathcad Professional software installation folder within ‘Handbook’ subfolder. HBK files can be also created using any text editor and the data must be saved as plain text file. ‘Handbook’ folder holds HBK files and Mathcad worksheets.

Mathcad software is used for engineering calculations and as CAS tool. Mathcad developer, Mathsoft, was acquired by Parametric Technology Corporation in 2006. HBK electronic book file can be opened by choosing ‘Open Book’ option from the ‘Help’ menu and supplying directory path of chosen file. In order to get the Queuing Theory Handbook from your Queuing Theory CD, it must be installed manually. User must locate or create a ‘Handbook’ folder on the disk where the software has been installed. Next, user must copy Queuing folder and queuing.hbk file from the Queuing Theory CD, and paste them into the ‘Handbook’ folder. Now the book should be available from applications menu.