Solved: Making an USB HDD available for other Computers..
 

...in a network.
So we have several PCS connected via WLAN, able to exchange files etc., but how do i make folders on the external HDD visible as connected drives on connected PCs WITHOUT external software like USB gate etc.? :hmmm:

SOLVED
Easy, problem was you have to go on an upper folder displaying the subfolders on the right side in the Windows explorer.
Only there on the right side you can right-click on the folder, and make it a connected network drive.
You cannot do that on the left side where the folder is directly displayed. Once more "a bit" idiotic by MS :doh:

Some companies offer so-called USB-Gates, you do not need this.