i'm being silly

C:\>fastboot getvar all
'fastboot' is not recognized as an internal or external command,
operable program or batch file.

C:\>cd ADB

C:\ADB>fastboot getvar all
'fastboot' is not recognized as an internal or external command,
operable program or batch file.

C:\ADB>cd ADB_HTC

C:\ADB\ADB_HTC>fastboot getvar all
'fastboot' is not recognized as an internal or external command,
operable program or batch file.

C:\ADB\ADB_HTC>htc_fastboot_2.0.6.exe getvar all
< waiting for device >
^C
C:\ADB\ADB_HTC>htc_fastboot_3.0.9.2.exe getvar all

C:\ADB\ADB_HTC>cd ..

C:\ADB>cd ADB_10

C:\ADB\ADB_10>fastboot getvar all
< waiting for device >
^C
C:\ADB\ADB_10>