ssmemb
(ssmemb ename sname)
The ssmemb function lets you test if a selection set sname contains a drawing entity specified by ename.
Arguments
The selection set specified by sname and the entity specified by ename must belong to the current drawing. The function is drawing-sensitive.
Return Value
The function returns ename, if ename is member of sname; otherwise, the function returns nil.
: (setq selset1 (ssget))
<Selset: 4b1f18cc:00000044>
: (ssmemb (entlast) selset1)
<EName: 0c0e4e60>
ssname, ssadd, ssdel