It removes all trailing blanks from tape records after reading them. On output, records are blank padded and blocked to create fixed length tape blocks. However, this requires that your terminal type be known to VMS in order for it to work properly. The screen is divided into three regions. Some of the commands expect a parameter to follow the keyword.
Some commands take numeric parameters and others take alphameric text.
After each command that results in some tape movement, the program will display the information on the screen. The session shown here illustrates how the commands would be entered in a command procedure. However, the basic commands remain the same. A few new two-character commands have been added in version 2.3. This now allows command procedures to trap errors and take steps as necessary to attempt recovery.