SGS_REQCH

Request choice

ACTION:
Waits for the user to press a key on the current SGS choice device and returns the number of the key selected. When choice device 0 is being used, the number is the position in the define keys string passed to SGS_DEFCH. If the key is not included in the string, 0 is returned.
CALL:
SGS_REQCH(n)
OUTPUT PARAMETERS:

n

I

The number of the key pressed.

GKS EFFECT:
All buffered output is plotted and for device 1 GKS request choice is called.