I'll take a stab at this, but Michael's done a good job already.
PartInNT.exe
This utility displays partition info about your local disks and partitions (as well as any errors or inconsistencies found in them), and allows this info to be saved to a file. Partition table errors can give BESR headaches, and this tool can be used by Symantec support to resolve these errors. The output of this utility can look pretty cryptic.
PqBoot32.exe
As Michael said, this utility allows you to choose what partition you want to be active (meaning, the partition that the system will try to boot from).
PtEdit.exe
As Michael said, this utility allows you to directly edit the partition table of a local drive.
SeaST.exe
This utility does several different things. The most common use for this tool is the button that gathers information for technical support. This means that it scours the local system for log, debug, history, job, and other files and puts them in one of your BESR program folders (so the files can be provided to technical support).
SmeDump.exe
This utility dumps a lot of information to a file, as Michael said. I believe this is another support tool.
Thanks.