PRACTICE commands are not case-sensitive. Each command has a long and short form. The significant letters are always written in upper case letters.
Example: The short form of SYStem.Up is SYS.U

You can execute this command as SYStem.Up, system.up, sys.up, system.u, ...

You can open the documentation of a TRACE32 command by typing the command in long or short for in the TRACE32 command line, then type space and press the F1 key. The corresponding PDF document will open at the correct location.