Syntax for Alias and Funckey commands

Can someone point to a resource for syntax for Alias/Funckey scripting? I came across very useful hotkeys online and would like to write my own, but limited by the lack of knowledge of the syntax. 

Some examples I came across online are as shown below. I can understand them, but I am sure the capability of this funckeys is limitless, if basic syntax is known. I could not find this syntax anywhere in Allegro help. 

Using a shift or ctrl key in combination with mouse wheel. Add the following line in the env file and start PCB Editor

button Swheel_up "FORM mini Alt; FORM mini Alt_subclass XXXXX; pop bbdrill -cursor"

While routing press the shift key and roll the mouse wheel in upward direction to place the via. To use the control key in place of shift then replace 'Swheel_up' with 'Cwheel_up' in the above line. Similarly if you want to use downward direction of wheel then replace 'Swheel_up' with 'Swheel_down'. If you want to use it with working layer model instead of alternate layer replace 'Alt' with 'WL'.

Source: https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1Od00000004uHFEAY&pageName=ArticleContent

Thanks,
Siva