techSaveTechFile

techSaveTechFile(
d_techID
) 
=> t / nil

Saves the specified technology database from virtual memory to the disk file from which it was opened.

d_techID

The identifier of the technology database.

`t`	The save completed successfully.
`nil`	The virtual memory version of the technology database was not saved; the specified technology database identifier is invalid or the system was not able to write to the directory containing the disk file.

techSaveTechFile( tfID )
=> t

Saves the technology database identified by tfID.