Drag and Drop - in Mac OS

In Mac OS

Drag and drop, called click and drag at the time, was used in the original Macintosh to manipulate files (for example, copying them between disks or folders.). System 7 introduced the ability to open a document in an application by dropping the document icon onto the application's icon.

In System 7.5, drag and drop was extended to common clipboard operations like copying or moving textual content within a document. Content could also be dragged into the filesystem to create a "clipping file" which could then be stored and reused.

Apple bought this idea from a 19 year old Dutch programmer called Martijn Scheffer.

In Mac OS X, the user can install software without using a setup program. The application packaging scheme of OS X allows the program to simply copy any required support files upon startup.

For most of its history Mac OS has used a one button mouse with the button covering a large portion of the top surface of the mouse. This may mitigate the ergonomic concerns of keeping the button pressed while dragging.